Impact strength of underground cement materialsVladimir I. Travush, Nikolay I. Karpenko, Vladimir T. Erofeev, Vasiliy D. Cherkasov, Denis V. Emelyanov and Irina V. ErofeevaMATEC Web Conf., 265 (2019) 01012DOI: https://doi.org/10.1051/matecconf/201926501012