  Sturm-Liouville spectral problem for equation $-(y'/r)'+qy=\lambda py$ with
generalized functions $r\ge 0$, $q$ and $p$ is considered. It is shown that the
problem may be reduced to analogous problem with $r\equiv 1$. The case of $q=0$
and self-similar $r$ and $p$ is considered as an example.
