@article{CHFMJ_2016_1_3_a6,
     author = {M. M. Turov},
     title = {Martinet~--- {Ramis} modulus for a quadratic system},
     journal = {\v{C}el\^abinskij fiziko-matemati\v{c}eskij \v{z}urnal},
     pages = {86--91},
     publisher = {mathdoc},
     volume = {1},
     number = {3},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CHFMJ_2016_1_3_a6/}
}