@article{ARM_1988__24_2_a3,
     author = {Do\v{s}l\'a, Zuzana and Do\v{s}l\'y, Ond\v{r}ej},
     title = {On transformations of singular quadratic functionals corresponding to equation $(py')'+qy=0$},
     journal = {Archivum mathematicum},
     pages = {75--81},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {1988},
     mrnumber = {983225},
     zbl = {0671.34010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1988__24_2_a3/}
}