Kai , Lan, Yan Taining, и Shao Chun. 2008. Записки Горного института 174 (март), 118-20. https://pmi.spmi.ru/pmi/article/view/7501.

Kai , Lan, Yan Taining, and Shao Chun. 2008. “Some Topics on Using Ultrasonic Method for Concrete Casting Level Measurement in Bored Pile Foundation”. Journal of Mining Institute 174 (March), 118-20. https://pmi.spmi.ru/pmi/article/view/7501.