JANUŠAUSKAITĖ, Nijolė. The problem of the second variation of the discrete generalized Mayer form’s functional. Lietuvos matematikos rinkinys, [S. l.], v. 38, n. II, p. 433–437 , 1998. DOI: 10.15388/LMD.1998.37950. Disponível em: https://www.zurnalai.vu.lt/LMR/article/view/37950. Acesso em: 27 nov. 2025.