Kargl , Hubert. 2009. "Cutting Technology With Point Attack Picks on Roadheaders and Its Challenges". Записки Горного института 181 (март), 104. https://pmi.spmi.ru/pmi/article/view/7040.

Kargl , Hubert. 2009. "Cutting Technology With Point Attack Picks on Roadheaders and Its Challenges". Journal of Mining Institute 181 (March), 104. https://pmi.spmi.ru/pmi/article/view/7040.