Backer; Wanmaker
Recueil des Travaux Chimiques des Pays-Bas, 1951 , vol. 70, p. 638,644
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Grivas; Taurins
Canadian Journal of Chemistry, 1958 , vol. 36, p. 771,772
Canadian Journal of Chemistry, 1959 , vol. 37, p. 1260,1263