@article{MV_1974_26_1_a25,
     author = {S. K. Ghosal and M. Chatterjee},
     title = {On perturbation theory of a system of quasi-linear ordinary differential equations},
     journal = {Matemati\v{c}ki vesnik},
     pages = {185 },
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/MV_1974_26_1_a25/}
}