1985
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Pierre Julien et al., « Un praticien suisse du XVIIIe siècle : Willem F. Daems, Johann Anton Grass von Portein 1684-1770, Arzt, Chirurg, Zahnarzt, Harndiagnostiker, Pharmazeut, Viehdoktor und Dorfpolitiker... », Revue d'Histoire de la Pharmacie, ID : 10670/1.rtithc
Julien Pierre, Fehlmann Hans-Rudolf. Un praticien suisse du XVIIIe siècle : Willem F. Daems, Johann Anton Grass von Portein 1684-1770, Arzt, Chirurg, Zahnarzt, Harndiagnostiker, Pharmazeut, Viehdoktor und Dorfpolitiker... . In: Revue d'histoire de la pharmacie, 73ᵉ année, n°266, 1985. pp. 269-270.