Geodesic
Singular matrix factorization problem with quadratically oscillating off-diagonal elements. Quasiclassical asymptotics of solutions with a diagonal element vanishing at the stationary point
Algebra i analiz, Tome 32 (2020) no. 5, pp. 37-61 
A. M. Budylin. Singular matrix factorization problem with quadratically oscillating off-diagonal elements. Quasiclassical asymptotics of solutions with a diagonal element vanishing at the stationary point. Algebra i analiz, Tome 32 (2020) no. 5, pp. 37-61. http://geodesic.mathdoc.fr/item/AA_2020_32_5_a1/
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     author = {A. M. Budylin},
     title = {Singular matrix factorization problem with quadratically oscillating off-diagonal elements. {Quasiclassical} asymptotics of solutions with a diagonal element vanishing at the stationary point},
     journal = {Algebra i analiz},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2020_32_5_a1/}
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