ZUBĖ, Severinas. Real ruled degree four toric surfaces in projective 3-space. Lietuvos matematikos rinkinys, [S. l.], v. 38, n. II, p. 191–195 , 1998. DOI: 10.15388/LMD.1998.37815. Disponível em: https://test.zurnalai.vu.lt/LMR/article/view/37815. Acesso em: 28 oct. 2025.