FOLKERS, Gerd; OTTO, Marc. pnn ag: Pharma Nation Network AG – CME online. CHIMIA, [S. l.], v. 57, n. 6, p. 345, 2003. DOI: 10.2533/000942903777679226. Disponível em: https://www.chimia.ch/chimia/article/view/2003_345. Acesso em: 28 feb. 2024.