1. On a lattice-point problem of H. Steinhaus;Beck, József;Studia Sci. Math. Hungar.,1989
2. Three lattice-point problems of Steinhaus;Croft, H. T.;Quart. J. Math. Oxford Ser. (2),1982
3. Problem Books in Mathematics;Croft, Hallard T.,1991
4. Pitman Monographs and Surveys in Pure and Applied Mathematics;Erdös, P.,1989
5. Problems and results in combinatorial geometry;Erdős, P.,1985