FECENKO, Jozef. Other Fundamental Systems of Solutions (D2 -2αD+α2 + β2 )n y=0, β≠0. - Registrovaný: Scopus, Registrovaný: Web of Science. In Mathematica Slovaca. - Bratislava : Slovak Academy of Sciences. ISSN 1337-2211, 2024, vol. 74, no. 5, pp. 1155-1164.