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| Hájková, Marie, The Lattice of Bi-Numerations of Arithmetic I (1971) |
| Hájková, Marie, The Lattice of Bi-Numerations of Arithmetic II (1971) |
| Hajnal, A., Some Results and Problems on Set Theory (1960) |
| Hajnal, A. ; Juhász, I., Intersection Properties of Open Sets |
| Hajnal, A. ; Juhász, I., Having a Small Weight is Determined by the Small Subspaces (1979) |
| Hajnal, A. ; Juhász, I. ; Szentmiklóssy, Z., On CCC Boolean Algebras and Partial Orders (1993) |
| Hajnal, A. ; Komjáth, P., Some Higher-Gap Examples in Combinatorial Set Theory (1984) |
| Hajnal, A. ; Milner, E. C., On $k$-Independent Subsets of a Closure (1985) |
| Hajnal, A. ; Nagy, Zs., Ramsey Games |
| Hajnal, Andras, On the Topological Product of Discrete Spaces (1964) |