@article{700128,
     title = {Some problems concerning the equivalences of two systems of differential equations},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[171]-179},
     mrnumber = {MR0877120},
     zbl = {0607.34036},
     url = {http://dml.mathdoc.fr/item/700128}
}

Švec, Marko. Some problems concerning the equivalences of two systems of differential equations, dans Equadiff 6, GDML_Books,  (1986), pp. [171]-179. http://gdmltest.u-ga.fr/item/700128/