Unsolvable problems for equational theories.
1967 ◽
Vol 8
(3)
◽
pp. 175-185
◽
Keyword(s):
Keyword(s):
1981 ◽
Vol 40
(1)
◽
pp. 24-30
◽
Keyword(s):
1990 ◽
Vol 75
(1-2)
◽
pp. 85-110
◽