TY  - BOOK
AU  - Rosales J C
AU  - Garcia-Sanchez P A
TI  - Numerical semigroups
SN  - 978-1-4419-0159-0
U1  - 512.2 
PY  - 2009///
CY  - New York
PB  - Springer-Verlag
KW  - Group theory
KW  - Semigroups
ER  -