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Langer A, Freeman MR, Armstrong PW.Langer A, et al. Among authors: armstrong pw.J Am Coll Cardiol. 1989 Jun;13(7):1495-502. doi: 10.1016/0735-1097(89)90338-0.J Am Coll Cardiol. 1989.PMID: 2786015Free article.
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Langer A, Goodman SG, Topol EJ, Charlesworth A, Skene AM, Wilcox RG, Armstrong PW.Langer A, et al. Among authors: armstrong pw.J Am Coll Cardiol. 1996 May;27(6):1327-32. doi: 10.1016/0735-1097(96)00012-5.J Am Coll Cardiol. 1996.PMID: 8626939Free article.Clinical Trial.
Singh N, Mironov D, Armstrong PW, Ross AM, Langer A.Singh N, et al. Among authors: armstrong pw.Circulation. 1996 Apr 1;93(7):1388-95. doi: 10.1161/01.cir.93.7.1388.Circulation. 1996.PMID: 8641028
Klootwijk P, Langer A, Meij S, Green C, Veldkamp RF, Ross AM, Armstrong PW, Simoons ML.Klootwijk P, et al. Among authors: armstrong pw.Eur Heart J. 1996 May;17(5):689-98. doi: 10.1093/oxfordjournals.eurheartj.a014935.Eur Heart J. 1996.PMID: 8737099Clinical Trial.