1. Hedrlín, Z. and Lambek, J. How comprehensive is the category of semigroups? J. of Algebra. To appear.
2. Hedrlín, Z. and McDowell, R. H. Partly ordered sets with given monoid of order-preserving mappings. Preprint of the Washington University, St. Louis.
3. On full embeddings of categories of algebras;Hedrlín;Ill. J. Math.,1966
4. On categorical embeddings of topological structures into algebraic;Hedrlín;Comment. Math. Univ. Carolinae,1966
5. Remark on Topological spaces with given semigroups;Hedrlín;Comment. Math. Univ. Carolinae,1963