1. Oscillations of bases for the natural numbers;Erdős;Proc. Amer. Math. Soc.,1975
2. Number Theory, Carbondale 1979;Erdős,1979
3. Problems and results on minimal bases in additive number theory;Erdős,1987
4. Ein Beitrag zur Theorie der Minimalbasen;Härtter;J. reine angew. Math.,1956
5. Simultaneous systems of representatives for finite families of finite sets;Jia;Proc. Amer. Math. Soc.,1988