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- [4] Klee, 1956, P AM MATH SOC, V7, P673, DOI DOI 10.2307/2033370.MR78661
- [6] MCCOY RA, TO BE PUBLISHED
- [7] SANDERSON DE, TO BE PUBLISHED
- [8] STALLINGS J, 1962, P CAMB PHILOS SOC, V58, P481
- [10] [No title captured]