@article{AA_2015_27_6_a1,
     author = {S. S. Afanas'eva and R. P. Vostokova},
     title = {Logarithms of formal $A$-modules in the case of small ramification},
     journal = {Algebra i analiz},
     pages = {6--13},
     publisher = {mathdoc},
     volume = {27},
     number = {6},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2015_27_6_a1/}
}