@article{DAN_1974_216_2_a7,
     author = {V. F. Pt\'ak and V. S. Retakh},
     title = {An abstract analog of an existence theorem for solutions of convolution equations},
     journal = {Doklady Akademii Nauk},
     pages = {267--269},
     publisher = {mathdoc},
     volume = {216},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_2_a7/}
}