%0 Journal Article %A Z. I. Leibenzon %T Algebraic-differential transformations of linear differential operators of arbitrary order and their spectral properties applicable to the inverse problem. I. The case of finite $\mathfrak N$ %J Sbornik. Mathematics %D 1972 %P 408-428 %V 16 %N 3 %U http://geodesic.mathdoc.fr/item/SM_1972_16_3_a6/ %G en %F SM_1972_16_3_a6