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Robinson RR, Doursout MF, Chelly JE, Powell MR, Little TM, Butler BD.Robinson RR, et al. Among authors: butler bd.Aviat Space Environ Med. 1996 Sep;67(9):835-40.Aviat Space Environ Med. 1996.PMID: 9025798
Robinson R, Swaby G, Sutton T, Fife C, Powell M, Butler BD.Robinson R, et al. Among authors: butler bd.Aviat Space Environ Med. 1997 Nov;68(11):1046-9.Aviat Space Environ Med. 1997.PMID: 9383507
Larson SR, Sutton T, Koch S, Butler BD.Larson SR, et al. Among authors: butler bd.Aviat Space Environ Med. 1993 Dec;64(12):1133-4.Aviat Space Environ Med. 1993.PMID: 8291995
Powell MR, Norfleet WT, Kumar KV, Butler BD.Powell MR, et al. Among authors: butler bd.Aviat Space Environ Med. 1995 Mar;66(3):273-5.Aviat Space Environ Med. 1995.PMID: 7661841