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Mendell JR, Engel WK, Derrer EC.Mendell JR, et al. Among authors: derrer ec.Science. 1971 Jun 11;172(3988):1143-5. doi: 10.1126/science.172.3988.1143.Science. 1971.PMID: 5574520
Engel WK, Derrer EC.Engel WK, et al. Among authors: derrer ec.Nature. 1975 Mar 13;254(5496):151-2. doi: 10.1038/254151a0.Nature. 1975.PMID: 1118004No abstract available.