PETRICH, Géza. RÄUMLICHE VIERECKE WINDSCHIEFER FLÄCHEN ZWEITER ORDNUNG Periodica Polytechnica Architecture, [S. l.], v. 23, n. 2-3, p. 133–148, 1979. Disponível em: https://pp.bme.hu/ar/article/view/2400. Acesso em: 2 jun. 2025.