@article{702236,
     title = {Application of bounded operators and Lyapunov's majorizing equations to the analysis of differential equations with a small parameter},
     booktitle = {Equadiff IV},
     series = {GDML\_Books},
     publisher = {Springer-Verlag},
     address = {Berlin},
     year = {1979},
     pages = {[356]-365},
     mrnumber = {MR0535356},
     zbl = {0441.47063},
     url = {http://dml.mathdoc.fr/item/702236}
}

Ryabov, Yu. Application of bounded operators and Lyapunov's majorizing equations to the analysis of differential equations with a small parameter, dans Equadiff IV, GDML_Books,  (1979), pp. [356]-365. http://gdmltest.u-ga.fr/item/702236/