TY  - BOOK
AU  - Valentina Barucci, Scott Chapman, Marco D'Anna, Ralf Fröberg
TI  - Numerical Semigroups 
SN  - 9783030408220
PB  - Springer
UR  - https://link.springer.com/openurl?genre=book&isbn=978-3-030-40822-0
ER  -