1. Andrzejewska J. The research of vertical displacements of the rock mass inside and in environment of the Kletno Bear Cave // Записки Горного института. 2007. Том 170№ 2. C. 93-96.

1. Andrzejewska J. // Journal of Mining Institute. 2007. Том 170№ 2. C. 93-96.