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Part III: Rapports et Comptes Rendus des Seances es Commissions
[48]Dobrovolsky, O. V.Stalinabad Obs. Bull. no. 19, 1957.Google Scholar
[49]
[49]Pour un exposé plus ancien de Witkowski, J. sur cette question, voir Bull. Soc. Amis Sciences et Leitres de Poznań, Série В, livraison XII, 1953.Google Scholar