[1]J. Andrzejewska, "The Research of Vertical Displacements of the Rock Mass Inside and in Environment of the Kletno Bear Cave", PMI, т. 170, вып. 2, сс. 93-96, апр. 2007.

[1]J. Andrzejewska, PMI, vol. 170, no. 2, pp. 93-96, Apr. 2007.