KVEDARAS, B.; KIBENKO , A. V.; PEROV, A. I. On some boundary problems. Lithuanian Mathematical Journal, [S. l.], v. 5, n. 1, p. 69–84, 1965. DOI: 10.15388/LMJ.1965.19542. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/19542. Acesso em: 8 jun. 2025.