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Kuonen P, Huynh-Ba G, Krummen VS, Stössel EM, Röthlisberger B, Salvi GE, Gerber J, Pjetursson BE, Joss A, Lang NP.Kuonen P, et al. Among authors: lang np.Oral Health Prev Dent. 2009;7(4):377-82.Oral Health Prev Dent. 2009.PMID: 20011756
Karayiannis A, Lang NP, Joss A, Nyman S.Karayiannis A, et al. Among authors: lang np.J Clin Periodontol. 1992 Aug;19(7):471-5. doi: 10.1111/j.1600-051x.1992.tb01159.x.J Clin Periodontol. 1992.PMID: 1430282
Brägger U, Schürch E Jr, Salvi G, von Wyttenbach T, Lang NP.Brägger U, et al. Among authors: lang np.Cleft Palate Craniofac J. 1992 Mar;29(2):179-85. doi: 10.1597/1545-1569_1992_029_0179_pciapw_2.3.co_2.Cleft Palate Craniofac J. 1992.PMID: 1571353
Joss A, Weber HP, Gerber C, Siegrist B, Curilović Z, Saxer UP, Lang NP.Joss A, et al. Among authors: lang np.Schweiz Monatsschr Zahnmed. 1992;102(5):541-8.Schweiz Monatsschr Zahnmed. 1992.PMID: 1598554
Siegrist BE, Brecx MC, Gusberti FA, Joss A, Lang NP.Siegrist BE, et al. Among authors: lang np.Clin Oral Implants Res. 1991 Jan-Mar;2(1):38-46. doi: 10.1034/j.1600-0501.1991.020105.x.Clin Oral Implants Res. 1991.PMID: 1807421
Hämmerle CH, Joss A, Lang NP.Hämmerle CH, et al. Among authors: lang np.J Clin Periodontol. 1991 Apr;18(4):233-9. doi: 10.1111/j.1600-051x.1991.tb00420.x.J Clin Periodontol. 1991.PMID: 1856303