@article{ZNSL_1980_93_a8,
     author = {V. A. Ivanov},
     title = {On the ray origin in the {Dirichlet} spectrum a~problem of {Diophantine} approximations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {164--185},
     publisher = {mathdoc},
     volume = {93},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_93_a8/}
}