@article{ARM_1969__5_4_a1,
     author = {Lorch, Lee},
     title = {Two elementary remarks on non-linear differential equations of the second order},
     journal = {Archivum mathematicum},
     pages = {173--175},
     publisher = {mathdoc},
     volume = {05},
     number = {4},
     year = {1969},
     mrnumber = {0277818},
     zbl = {0242.34033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a1/}
}