Broul , Jaroslav, и Jiří Husárik. 2007. "Special Conditions of Transporting Routes Construction in Undermined Areas in Czech Republic". Записки Горного института 170 (2), 97-99. https://pmi.spmi.ru/pmi/article/view/7723.

Broul , Jaroslav, and Jiří Husárik. 2007. "Special Conditions of Transportation Routes Construction in Undermined Areas in Czech Republic". Journal of Mining Institute 170 (2), 97-99. https://pmi.spmi.ru/pmi/article/view/7723.