1. Zs. Baranyai, (a), to be published later.
2. Zs. Baranyai, (b), to be published later.
3. On various versions of the defective coin problem;Bellman;Inf. Control,1961
4. R. C. Bose and R. I. Nelson, 1961, A sorting problem, Case Inst. Technol., Computing Center, Rept. No. 1043, pp. 1-22.
5. Balance scale sorting;Cairns;Am. Math. Monthly,1963