1. A fixed point theorem for nonincreasing mappings;Abian;Boll. Un. Mat. Ital.,1969
2. On the cofinality of ordinal numbers;Abian;Math. Arm.,1969
3. Some special properties of cofinality of ordinal numbers;Abian;Math. Ann.,1970
4. The common points of families of normal functions;Abian;Canad. J. Math.,1973
5. On the bounds of the minimal length of sequences representing simply ordered sets;Abian;Arch. Math. Logik Grundlag.,1967