Geodesic
On the reduction of a second-order linear system to a triangular system with identical diagonal coefficients
Differencialʹnye uravneniâ, Tome 30 (1994) no. 6, pp. 987-991 
A. V. Lasunsky. On the reduction of a second-order linear system to a triangular system with identical diagonal coefficients. Differencialʹnye uravneniâ, Tome 30 (1994) no. 6, pp. 987-991. http://geodesic.mathdoc.fr/item/DE_1994_30_6_a7/
@article{DE_1994_30_6_a7,
     author = {A. V. Lasunsky},
     title = {On the reduction of a second-order linear system to a triangular system with identical diagonal coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {987--991},
     year = {1994},
     volume = {30},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_6_a7/}
}
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