Goodrich, L. Carrington (Luther Carrington), 1894-
Waverly Press, 1935
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Forsyth, Frederick, 1938-
Serambi Ilmu Semesta, 2013
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Kecskemeti, Paul
Stanford University Press, 1958
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Haag, WG
Lexiton University of Kentucky 1948
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Zaharia, Gheorghe
Stiintifica si Enciclopedica, 1975
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