Article in Polish Wikipedia says he read "Cybernetics or Control and Communication in the Animal and the Machine" by N. Wiener and "A Mathematical Theory of Communication" by C. E. Shannon when he was an assistant at the Jagiellonian University (1948-50). Cited source is a book ''Świat na krawędzi'', a series of interviews with Lem, written by Tomasz Fiałkowski (p. 56-57 specifically).

His entry in the Polish Wikipedia says he read Cybernetics or Control and Communication in the Animal and the Machine by N. Wiener and A Mathematical Theory of Communication by C. E. Shannon when he was an assistant at the Jagiellonian University (1948-50). 

Cited source is a book Świat na krawędzi, a series of interviews with Lem, written by Tomasz Fiałkowski (p. 56-57 specifically).

Article in Polish Wikipedia says he read "Cybernetics or Control and Communication in the Animal and the Machine" by N. Wiener and "A Mathematical Theory of Communication" by C. E. Shannon when he was an assistant at the Jagiellonian University (1948-50).

Article in Polish Wikipedia says he read "Cybernetics or Control and Communication in the Animal and the Machine" by N. Wiener and "A Mathematical Theory of Communication" by C. E. Shannon when he was an assistant at the Jagiellonian University (1948-50). Cited source is a book ''Świat na krawędzi'', a series of interviews with Lem, written by Tomasz Fiałkowski (p. 56-57 specifically).