

[*]  (As editor, joint with H. Bass, N. Van Chau) Lecture notes from the International School and Workshop (ICPA2006) held in Hanoi, October 920, 2006. Publishing House for Science and Technology, Hanoi, 2007. xii+160 pp.1406 


[29]  (Joint with Abdul Rauf) A new formulation of the Jacobian Conjecture in characteristic p , accepted to Journal of Pure and Applied Algebra (JPAA). 
[28]  (Joint with Abdul Rauf) The profinite polynomial automorphism group , Journal of Pure and Applied Algebra 219.10 (2015): 47084727 
[27]  Invariants and conjugacy classes of triangular polynomial maps , J. Pure Appl. Algebra 219, No. 12, 52065224 (2015). 
[26]  Triangular polynomial maps in characteristic p , accepted to Journal of Algebra and Number Theory (ANT) 
[25]  (Joint with R. Willems) Keller maps of low degree over finite fields , accepted to proceedings of GABAG2012. 
[24]  (Joint with A. Crachiola), Rigid rings , accepted to Comm. in Algebra 
[23]  (Joint with R. Willems) Polynomial automorphisms over finite fields: Mimicking nontame and tame maps by the Derksen group , Serdica math. J. 37, 2011 (305322) (Preprint version) 
[22]  (Joint with J. Berson, A. Dubouloz, JPh. Furter ), Locally tame plane polynomial automorphisms , Journal of Pure and Applied Algebra, Volume 216, Issue 1, January 2012, Pages 149  153 (Preprint version) 
[21]  (Joint with H. Derksen, D. Finston and A. van den Essen), Unipotent group actions on affine varieties , Journal of Algebra Volume 336, Issue 1, 15 June 2011, Pages 200208 (Preprint version) . Addendum , the paper misses an acknowledgement to prof. Hanspeter Kraft ! 
[20]  (Joint with JPh. Furter) A Characterization of Semisimple Plane Polynomial Automorphisms , J. Pure Appl. Algebra 214 No. 5 (2010) 574583 (Preprint version) 
[19]  (Joint with E. Edo and A. van den Essen) A note on k[z]automorphisms in two variables , J. Pure Appl. Algebra 213 No. 6 (2009) 11971200 (Preprint version) 
[18]  (Joint with PM. Poloni) The Nagata automorphism is shifted linearizable , J. of Algebra 321 No. 3 (2009) 879889 (Preprint version) 
[17]  (Joint with H. Peters) Polynomial maps which are roots of power series, , Mathematische Zeitschrift, 259, No.4 (2008) 903914 (Preprint version) 
[16]  (Joint with D. Finston) Constructing (almost) rigid rings and a UFD having infinitely generated Derksen and MakarLimanov invariant. , Canad. Math. Bull. 53(2010), 7786 (Preprint version) 
[15]  (Joint with D.Finston) The Automorphism Group of Certain Factorial Threefolds and a Cancellation Problem. , Israel J. Math 163 (2008)No. 1 (Preprint version) 
[14]  (Joint with Nguyen Van Chau, as editors) Some open questions on polynomial automorphisms and related topics. , Acta Math. Vietnamica Vol. 32, No 23 (2007) 303318 
[13]  On the methods to construct UFD counterexamples to a cancellation problem , Acta Math. Vietnamica Vol. 32, No 23 (2007) 215222 (Preprint version) 
[12]  (Joint with JPh.Furter) Locally finite polynomial endomorphisms , J. Pure Appl. Algebra 211 (2007), no. 2, 445458. (Preprint version) 
[11]  Infinitely generated Derksen and MakarLimanov invariant. , Osaka J. Math. 44 (2007), 883886 (Preprint version) 
[10]  (Joint with A.van den Essen, S.V\'en\'ereau) The Special Automorphism group of R[t]/(t^m)[X_1,...,X_n] and coordinates of a subring of R[t][X_1,...,X_m]. , J. Pure Appl. Alg. 210 (2007)no.1. 141146 (Preprint version) 
[9]  (Joint with B. Škorić, T. Kevenaar, P. Tuyls ) Informationtheoretic analysis of capacitive Physical Unclonable Functions, , J. Appl. Phys. 100, 024902 (2006). (Preprint version) 
[8]  (Joint with A.Crachiola) The Derksen invariant vs. the MakarLimanov invariant. , Proc. Amer. Math. Soc. 131 (2003), no.11. 33653369. (Preprint version) 
[7]  The commuting derivations conjecture , J. Pure Appl. Algebra 179 (2003), No.12. 159168. (Preprint version) 
[6]  The automorphism group of C[T]/(T^m)[X_1,...,X_n] , Comm. Algebra 30 (2002) no.2. 619629. (Preprint version) 
[5]  The linearisation conjecture and other problems over nonreduced rings. , Comm. Algebra 30 (2002) no.4. 16931704 (Preprint version) 
[4]  (Joint with J.Berson, A.van den Essen) Derivations having divergence zero on R[X,Y]. , Israel J.Math. 124 (2001). (Preprint version) 
[3]  Polynomial automorphisms over finite fields. Serdica Math. J. 27 (2001) no.4. 343350. (Preprint version) 
[2]  An algorithm to compute the kernel of a derivation up to a certain degree. J.Symbolic Computation 29 (2000), no.6. 959970 (Preprint version) 
[1]  Triangular monomial derivations on k[X_1,X_2,X_3,X_4] have kernel generated by at most four elements. J.Pure Appl. Algebra 153 (2000) no.2. 165170 (Preprint version) 


[*]  (Joint with M. de Bondt), Computing preimages of polynomial maps. 


2007  An open problem on polynomial automorphisms over finite fields , explaining a problem for nonexperts 
2006?  Expressing A^z in terms of A^{1},..., A^{p} and analytic functions. , unpublished report 
2006  (Joint with R. Brinkman and W. Jonker) A lucky dip as a secure data store , WISSEC 2006 
2006  (Joint with B. Škorić and seven more authors) ALGSICS  Combining Physics and Cryptography to Enhance Security and Privacy in RFID Systems , WISSEC 2006 
2003  Polynomial Endomorphisms and Kernels of Derivations , Ph.D. Thesis, University of Nijmegen. 
1998  Hilbert's 14th problem and related topics , Master's Thesis, University of Nijmegen. 


2007  What to expect when staying long in Oberwolfach , An impression of my 3 month stay at the MFO as an Oberwolfach Leibniz Fellow. 