@article{PFMT_2020_2_a15,
     author = {N. V. Ryabchenko and D. A. Volkov and A. P. Starovoitov},
     title = {A criterion for the existence and uniqueness of polyorthogonal polynomials of the second type},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {85--90},
     publisher = {mathdoc},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_2_a15/}
}