Geodesic
Homotopies of positive canonical systems with periodic coefficients
Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 2, pp. 67-68 
A. L. Berezovskii; Yu. G. Borisovich. Homotopies of positive canonical systems with periodic coefficients. Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 2, pp. 67-68. http://geodesic.mathdoc.fr/item/FAA_1976_10_2_a9/
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     title = {Homotopies of positive canonical systems with periodic coefficients},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1976_10_2_a9/}
}
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