@article{ARM_1981__17_4_a2,
     author = {Kalas, Josef},
     title = {Asymptotic behaviour of equations $\dot z=q(t,z)-p(t)z^2$ and $\ddot x=x\varphi (t,\dot xx^{-1})$},
     journal = {Archivum mathematicum},
     pages = {191--206},
     publisher = {mathdoc},
     volume = {17},
     number = {4},
     year = {1981},
     mrnumber = {672659},
     zbl = {0514.34004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1981__17_4_a2/}
}