@ARTICLE{Luo_Yongjiang_Detection_2015, author={Luo, Yongjiang and Li, Lijia and Peng, Jianming and Yin, Kun and Li, Peng and Gan, Xin and Zhao, Letao and Su, Wei}, number={No 4}, journal={Archives of Mining Sciences}, howpublished={online}, year={2015}, publisher={Committee of Mining PAS}, title={Detection Of Multilayer Cavities By Employing RC-DTH Air Hammer System And Cavity Auto Scanning Laser System}, URL={http://ochroma.man.poznan.pl/Content/94015/PDF/10267-Volume60_Issue4-13_paper.pdf}, doi={10.1515/amsc-2015-0069}, }