Lickfett , B., & Partmann , F. (2008). Записки Горного института, 174, 101-102. извлечено от https://pmi.spmi.ru/pmi/article/view/7495

Lickfett , B., & Partmann , F. (2008). Determination of accuracy of a combined system of tachymeter and echo-sounder and suggestions of improvement. Journal of Mining Institute, 174, 101-102. Retrieved from https://pmi.spmi.ru/pmi/article/view/7495