@article{JMAG_2007_3_2_a6,
     author = {M. M. Sheremeta and O. A. Volokh},
     title = {On a convergence of formal power series under a special condition on the {Gelfond{\textendash}Leont'ev} derivatives},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {241--252},
     year = {2007},
     volume = {3},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2007_3_2_a6/}
}