@article{PORMA_1976__35_2_115277,
     author = {Holmes, Mark H. and Stein, F. Max},
     title = {Sturmian theory and transformations for the {Riccati} equation},
     journal = {Portugaliae mathematica},
     pages = {65--73},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {1976},
     mrnumber = {0430375},
     zbl = {0398.34029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1976__35_2_115277/}
}