Artikel Jurnal
edited by A.D. Buckingham, E. Lippert, S. Bratos
John Wiley & Sons, 1978
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Krevelen, D. W. van (Dirk Willem), author
Elsevier, 1976
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Gordon, Manfred
Addison-Wesley , 1963
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M.F. Lappert ..... [et al.]
Ellis Horwood Publishers, 1980
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