Geomechanical assessments of simultaneous operation in the case of transition from Open Pit to Underground in Vietnam / Zbigniew NIEDBALSKI, Phu Minh Vuong NGUYEN, Eleonora Widzyk-Caperhart // W: POL-VIET 2017 : 4\textsuperscript{th} international conference Scientific-research cooperation between Vietnam and Poland : 20–22 November 2017, Krakow, Poland : book of abstracts / ed. Jadwiga Jarzyna. — Kraków : Wydawnictwa AGH, 2017. — ISBN: 978-83-7464-752-0. — S. 26. — P. .M .V. Nguyen - dod. afiliacja: AMTC, University of Chile