[1] J. R. ISBELL:
Subobjects, adequacy, completeness and categories of algebras. Rozprawy matematiczne XXXV, Warszawa 1964.
Zbl 0133.26703
[2] Z. HEDRLÍN A. PULTR:
On full embedding of categories of algebras. Illinois J. of Math., 10 (1966), 392-406.
MR 0191858
[3] Z. HEDRLÍN A. PULTR:
On categorial embeddings of topological structures into algebraic. CMUC 7 (1966), 377-400.
MR 0202797
[4] A. PULTR:
On selecting of morphisms among all mappings between underlying sets of objects in concrete categories and realisation of these. CMUC 8, 1 (1967), 53-83.
MR 0210764