@article{MASLO_1980__30_3_a12,
     author = {Gera, Milan},
     title = {\"Uber die {Untermengen} der {L\"osungen} der {Gleichung} $x'''+a(t)x"+b(t)x'+c(t)x= 0 c(t)\geq 0$},
     journal = {Mathematica slovaca},
     pages = {313--326},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1980},
     mrnumber = {587259},
     zbl = {0443.34034},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1980__30_3_a12/}
}