@article{702171,
     title = {Transformation of ordinary second-order linear diferential equations},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Publishing House of the Czechoslovak Academy of Sciences},
     address = {Prague},
     year = {1963},
     pages = {27-38},
     mrnumber = {MR0170054},
     zbl = {0138.32402},
     url = {http://dml.mathdoc.fr/item/702171}
}

Borůvka, O. Transformation of ordinary second-order linear diferential equations, dans Differential Equations and Their Applications, GDML_Books,  (1963), pp. 27-38. http://gdmltest.u-ga.fr/item/702171/