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- [42] RICHNESS AND CONSTANTS OF CERTAIN MONADIC RINGS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1971, 273 (21): : 953 - &
- [46] FURTHER REMARKS ON ONTOGENY OF CERTAIN CARBONIFEROUS PLANTS PHYTOMORPHOLOGY, 1967, 17 (1-4): : 330 - +