Rotsel, Ralph William
Ph. D. Dissertation, University of Pittsburgh, 1981. 273 p. (DAI-A 43(5).)
Korjakina, L. W.
Quarber Merkur 23(2):50-55. December 1985.
Pollak, Seweryn
Quarber Merkur No. 59:52-62. August 1983.
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