@article{UZMU_1956_181_181_a5,
     author = {I. A. Frid},
     title = {On the stability of solutions of a linear differential equation with retardation in the critical case},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {181},
     number = {181},
     year = {1956},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1956_181_181_a5/}
}