Tome 21 (1971) no. 4
Sommaire
Positive rational semigroups and commutative power joined cancellative semigroups without idempotent
p. 567-576
p. 577-589
p. 610-618
p. 619-624
p. 625-632
p. 653-660
p. 661-671
p. 683-695