Publications
] Numerical semigroups with embedding dimension three. Arch. Math. (Basel). 2004;83:488-496.Edit
Saturated numerical semigroups. Houston J. Math.. 2004;30:321-330 (electronic).Edit
Ideals of finitely generated commutative monoids. Semigroup Forum. 2003;66:305-322.Edit
Numerical semigroups with maximal embedding dimension. Int. J. Commut. Rings. 2003;2:47-53.Edit
The oversemigroups of a numerical semigroup. Semigroup Forum. 2003;67:145-158.Edit
Proportionally modular Diophantine inequalities. J. Number Theory. 2003;103:281-294.Edit
On Buchsbaum simplicial affine semigroups. Pacific J. Math.. 2002;202:329-339.Edit
On the number of factorizations of an element in an atomic monoid. Adv. in Appl. Math.. 2002;29:438-453.Edit
Presentations of finitely generated submonoids of finitely generated commutative monoids. Internat. J. Algebra Comput.. 2002;12:659-670.Edit
Systems of inequalities and numerical semigroups. J. London Math. Soc. (2). 2002;65:611-623.Edit
Commutative ideal extensions of abelian groups. Semigroup Forum. 2001;62:311-316.Edit
Computing the elasticity of a Krull monoid. Linear Algebra Appl.. 2001;336:191-200.Edit
Irreducible ideals of finitely generated commutative monoids. J. Algebra. 2001;238:328-344.Edit
Minimal presentations of full subsemigroups of $\bold N^2$. Rocky Mountain J. Math.. 2001;31:1417-1422.Edit
On full affine semigroups. J. Pure Appl. Algebra. 2000;149:295-303.Edit
Reduced commutative monoids with two Archimedean components. Boll. Unione Mat. Ital. Sez. B Artic. Ric. Mat. (8). 2000;3:471-484.Edit
On the structure of simplicial affine semigroups. Proc. Roy. Soc. Edinburgh Sect. A. 2000;130:1017-1028.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 normal affine semigroups. Linear Algebra Appl.. 1999;286:175-186.Edit
Numerical semigroups generated by intervals. Pacific J. Math.. 1999;191:75-83.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
On the structure of Cohen-Macaulay simplicial affine semigroups. Comm. Algebra. 1999;27:511-518.Edit
On Cohen-Macaulay and Gorenstein simplicial affine semigroups. Proc. Edinburgh Math. Soc. (2). 1998;41:517-537.Edit