@article{ARM_1995__31_3_a5,
     author = {Do\v{s}l\'y, Ond\v{r}ej and Komenda, Jan},
     title = {Conjugacy criteria and principal solutions of self-adjoint differential equations},
     journal = {Archivum mathematicum},
     pages = {217--238},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1995},
     mrnumber = {1368260},
     zbl = {0841.34033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1995__31_3_a5/}
}