Não informado. (1968). IEEE international convention digest. Institute of Electrical and Electronics Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. IEEE International Convention Digest. New York: Institute of Electrical and Electronics Engineers, 1968.
Lua MLA (8ú heag.)Não informado. IEEE International Convention Digest. Institute of Electrical and Electronics Engineers, 1968.
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