1. Broul J., Husárik J. Special conditions of transporting routes construction in undermined areas in Czech Republic // Записки Горного института. 2007. Том 170№ 2. C. 97-99.

1. Broul J., Husárik J. Special conditions of transportation routes construction in undermined areas in Czech Republic // Journal of Mining Institute. 2007. Том 170№ 2. C. 97-99.