Geodesic
Operator theoretical proof of the Arnold alternation theorem and its generalization
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 12 (2005) no. 1, pp. 119-125 Cet article a éte moissonné depuis la source Math-Net.Ru

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A generalization of the Arnold alternation theorem and the Sturm oscillation theorem in the case of general boundary conditions, both in the context of operator differential equations, are obtained. 
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     author = {F. S. Rofe-Beketov},
     title = {Operator theoretical proof of the {Arnold} alternation theorem and its generalization},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {119--125},
     year = {2005},
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     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2005_12_1_a8/}
}
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F. S. Rofe-Beketov. Operator theoretical proof of the Arnold alternation theorem and its generalization. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 12 (2005) no. 1, pp. 119-125. http://geodesic.mathdoc.fr/item/JMAG_2005_12_1_a8/