Geodesic
The measure of nonregularity of quasitriangular systems
Differencialʹnye uravneniâ, Tome 11 (1975) no. 8, pp. 1497-1500 
A. Azamov. The measure of nonregularity of quasitriangular systems. Differencialʹnye uravneniâ, Tome 11 (1975) no. 8, pp. 1497-1500. http://geodesic.mathdoc.fr/item/DE_1975_11_8_a14/
@article{DE_1975_11_8_a14,
     author = {A. Azamov},
     title = {The measure of nonregularity of quasitriangular systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1497--1500},
     year = {1975},
     volume = {11},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_8_a14/}
}
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