@article{10_21136_CMJ_1970_100943,
     author = {Tvrd\'y, Milan},
     title = {The normal form and the stability of solutions of a system of differential equations in the complex domain},
     journal = {Czechoslovak Mathematical Journal},
     pages = {39--73},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1970},
     doi = {10.21136/CMJ.1970.100943},
     mrnumber = {0257449},
     zbl = {0198.43101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100943/}
}