[BACSICH] [74] Paul D. Bacsich:
Model theory of epimorphisms. Canad. Math. Bull. 17 (4) (1974), 471-477.
MR 0373881
[HERRLICH-STRECKER] [73] H. Herrlich G. Strecker:
Category Theory. Allyn and Bacon, Boston, 1973.
MR 0349791
[ISBELL] [67] J. Isbell:
Epimorphisms and dominions. Proc. Conf. on Categorical Algebra La Jolla 1965, Springer-Verlag, Berlin, 1967.
MR 0209202
[LEHMANN-PASZTOR] [82] D. Lehmann A. Pasztor:
Epis need not be dense. Theor. Comp. Sci. 17 (1982), 151-161.
MR 0645710
[PASZTOR] [82] A. Pasztor:
The epis of POS(Z). Comment. Math. Univ. Carolinae 23 (1982), 285-299.
MR 0664973
[PASZTOR] [82a] A. Pasztor:
On P-dominions of continuous algebras. Bericht 13/82, Inst, für Informatik, Univ. Stuttgart, to appear in Journ. of Pure and Appl. Algebra.
MR 0849908