VASILENKO, V. P.; YANISHEVSKY, A. P. On the small parameter method in the gyrocompass theory. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 1, p. 70–75, 1970. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8482. Acesso em: 6 dec. 2025.