2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110281This note reports on the recent advancements in the search for explicit representation, in classical special functions, of the solutions of the fourth-order ordinary differential equations named Bessel-type, Jacobi-type, Laguerre-type, Legendre-type.11 pagesClassical Analysis and ODEsPrimary: 33C15, 33D15, 33F10. Secondary: 33C05, 34B05text