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MR1223513 (95e:47032) 47B25 (34L05 47B50 47E05)
Ćurgus, Branko; Najman, Branko The operator $({\rm sgn}\,x)d\sp 2/dx\sp 2$ is similar to a selfadjoint operator in $L\sp 2({\bf R})$. Proc. Amer. Math. Soc. 123 (1995), no. 4, 1125–1128.
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