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Availability of Illegal Drugs During the COVID-19 Pandemic in Western Germany.
Scherbaum N, Bonnet U, Hafermann H, Schifano F, Bender S, Grigoleit T, Kuhn J, Nyhuis P, Preuss UW, Reymann G, Schneider U, Shibata J, Specka M. Scherbaum N, et al. Among authors: hafermann h. Front Psychiatry. 2021 Apr 23;12:648273. doi: 10.3389/fpsyt.2021.648273. eCollection 2021. Front Psychiatry. 2021. PMID: 33967857 Free PMC article.
Efficient perturbation theory for quantum lattice models.
Hafermann H, Li G, Rubtsov AN, Katsnelson MI, Lichtenstein AI, Monien H. Hafermann H, et al. Phys Rev Lett. 2009 May 22;102(20):206401. doi: 10.1103/PhysRevLett.102.206401. Epub 2009 May 19. Phys Rev Lett. 2009. PMID: 19519044 Free article.