TY  - JOUR
A1  - Denecke, Klaus-Dieter
A1  - Koppitz, Jörg
T1  - Pre-solid varieties of commutative semigroups
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Denecke, Klaus-Dieter
A1  - Koppitz, Jörg
T1  - M-solid varieties of semigroups
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Denecke, Klaus-Dieter
A1  - Koppitz, Jörg
T1  - Pre-solid varieties of semigroups
Y1  - 1995
ER  -