Geodesic
On the Similarity of Some Differential Operators to Self-Adjoint Ones
Matematičeskie zametki, Tome 72 (2002) no. 2, pp. 292-302 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper is devoted to the study of the similarity to self-adjoint operators of operators of the form $L=-\frac {\operatorname {sign}x}{|x|^\alpha p(x)}\,\frac {d^2}{dx^2}$, $\alpha >-1$, in the space $L_2(\mathbb R)$ with weight $|x|^\alpha p(x)$. As is well known, the answer to this problem in the case $p(x)\equiv 1$ is positive; it was obtained by using delicate methods of the theory of Hilbert spaces with indefinite metric. The use of a general similarity criterion in combination with methods of perturbation theory for differential operators allows us to generalize this result to a much wider class of weight functions $p(x)$. 
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M. M. Faddeev; R. G. Shterenberg. On the Similarity of Some Differential Operators to Self-Adjoint Ones. Matematičeskie zametki, Tome 72 (2002) no. 2, pp. 292-302. http://geodesic.mathdoc.fr/item/MZM_2002_72_2_a12/

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