Zhussupbekov, A. et al. 2019. CONTROL AND QUALITY OF PILES BY NON-DESTRUCTIVE EXPRESS METHODS: LOW STRAIN METHOD AND CROSS-HOLE SONIC LOGGING. International Journal for Computational Civil and Structural Engineering. 15, 1 (Mar. 2019), 171–180. DOI:https://doi.org/10.22337/2587-9618-2019-15-1-171-180.