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Part III: Rapports et Comptes Rendus des Seances es Commissions
[10]Väisälä, V. Astronomisch-optisches Forschungsinstitut der Universität Turku. Astronomia-optika institúció de Universitato de Turku, Informo no. 14. Turku, 1955.Google Scholar
[11]
[11]Oterma, L., Recherches portant sur des télescopes pourvus d’une lame correctrice. Annales Universitatis Turkuensis, ser. A, tome XIX. Informo no. 9. Helsinki, 1955.Google Scholar
[12]
[12]Sweet, M. Electronics, Nov. 1946, 105.Google Scholar