Dzуadуk V. K. On one method to construct normal in A. N. Tikhonov’s sense of linear equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 2, p. 235–239, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8506. Acesso em: 7 apr. 2025.