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Davis JC, Sheffield PJ, Schuknecht L, Heimbach RD, Dunn JM, Douglas G, Anderson GK.Davis JC, et al. Among authors: sheffield pj.Aviat Space Environ Med. 1977 Aug;48(8):722-30.Aviat Space Environ Med. 1977.PMID: 889546
Sheffield PJ, Stork RL, Morgan TR.Sheffield PJ, et al.Aviat Space Environ Med. 1977 Feb;48(2):132-7.Aviat Space Environ Med. 1977.PMID: 871282Clinical Trial.