Publications
] Minimal presentations of full subsemigroups of $\bold N^2$. Rocky Mountain J. Math.. 2001;31:1417-1422.Edit
Commutative ideal extensions of abelian groups. Semigroup Forum. 2001;62:311-316.Edit
Irreducible ideals of finitely generated commutative monoids. J. Algebra. 2001;238:328-344.Edit
On the structure of simplicial affine semigroups. Proc. Roy. Soc. Edinburgh Sect. A. 2000;130:1017-1028.Edit
Reduced commutative monoids with two Archimedean components. Boll. Unione Mat. Ital. Sez. B Artic. Ric. Mat. (8). 2000;3:471-484.Edit
On full affine semigroups. J. Pure Appl. Algebra. 2000;149:295-303.Edit
Presentations for subsemigroups of finitely generated commutative semigroups. Israel J. Math.. 1999;113:269-283.Edit
On presentations of commutative monoids. Internat. J. Algebra Comput.. 1999;9:539-553.Edit
Finitely generated commutative monoids Nova Science Publishers, Inc., Commack, NY 1999.Edit
On free affine semigroups. Semigroup Forum. 1999;58:367-385.Edit
On the structure of Cohen-Macaulay simplicial affine semigroups. Comm. Algebra. 1999;27:511-518.Edit
On normal affine semigroups. Linear Algebra Appl.. 1999;286:175-186.Edit
On Cohen-Macaulay and Gorenstein simplicial affine semigroups. Proc. Edinburgh Math. Soc. (2). 1998;41:517-537.Edit
On Cohen-Macaulay subsemigroups of $\bold N^2$. Comm. Algebra. 1998;26:2543-2558.Edit
On numerical semigroups with high embedding dimension. J. Algebra. 1998;203:567-578.Edit
Nonnegative elements of subgroups of $\bf Z^n$. Linear Algebra Appl.. 1998;270:351-357.Edit
On complete intersection affine semigroups. Comm. Algebra. 1995;23:5395-5412.Edit