@article{DE_1990_26_5_a4,
     author = {Z. S. Grinshpun},
     title = {Differential equations of orthogonal {Bernstein--Szeg{\H} o} polynomials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {769--776},
     publisher = {mathdoc},
     volume = {26},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_5_a4/}
}