NEUENSCHWANDER, Markus; FREY, Alfred. Synthese von Nonaheptafulvalen-Vorstufen. CHIMIA, [S. l.], v. 31, n. 8, p. 333, 1977. DOI: 10.2533/chimia.1977.333. Disponível em: https://www.chimia.ch/chimia/article/view/1977_333. Acesso em: 6 apr. 2025.