Sviedrys, R.: A case study of the influence of social factors on the scientific work of Francisco José de Caldas, I/48. [Vortragsbericht.], in: XI-e Congrès International d'histoire des sciences. Sommaires (Sect. No. 1m 2 et 3.) Varsovie - Cracovie aout 24-29 1965., Warschau 1965, S. 63 markieren