[en] Expansion formulae over the product of the solutions of two selfadjoint Sturm-Liouville problems are obtained. An explicit form of the operators for which these formulae are expansions of the unit is constructed. 9 refs
Original Title
Ob operatorakh, svyazannykh s razlozheniyami po proizvedeniyam reshenij dvukh zadach Shturma-Liuvillya