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Author/Creator
- Pētera Stučkas Latvijas Valsts universitāte. Matēmatikas un dabas zinātņu fakultāte1
- Reale accademia delle scienze fisiche e matematiche di Napoli1
- Schaaf, William L. (William Leonard), 1898-19921
- Scuola normale superiore (Italy). Classe di scienze1
- Sociedad Matemt̀ica Espaǫla1
- United States. National Bureau of Standards1
- University of Edinburgh. Mathematical Dept1
- University of Minnesota1
- Weinberg, A. M.1