@article{PFMT_2020_3_a13,
     author = {A. P. Starovoitov and N. V. Ryabchenko and A. A. Drapeza},
     title = {A criterion for the existence and uniqueness of polyorthogonal polynomials of the first type},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {82--86},
     publisher = {mathdoc},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_3_a13/}
}