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de Wit JP, Purchase IF, van der Walt JP, Vorster LJ.de Wit JP, et al. Among authors: purchase if.S Afr Med J. 1966 Dec 17;40(45):1097-100.S Afr Med J. 1966.PMID: 5334279Review.No abstract available.
Engelbrecht JC, Purchase IF.Engelbrecht JC, et al. Among authors: purchase if.S Afr Med J. 1969 May 3;43(18):524-8.S Afr Med J. 1969.PMID: 4977629No abstract available.
Holzapfel CW, Purchase IF, Steyn PS, Gouws L.Holzapfel CW, et al. Among authors: purchase if.S Afr Med J. 1966 Dec 17;40(45):1100-1.S Afr Med J. 1966.PMID: 6006093No abstract available.
Johannsen E, Purchase IF.Johannsen E, et al. Among authors: purchase if.S Afr Med J. 1969 Mar 22;43(12):326-8.S Afr Med J. 1969.PMID: 5769259No abstract available.