@article{CMFD_2013_47_a1,
     author = {A. V. Glushak and H. K. Avad},
     title = {On the solvability of an abstract differential equation of fractional order with a~variable operator},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {18--32},
     publisher = {mathdoc},
     volume = {47},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2013_47_a1/}
}