Comparing composition and bulk-rock characteristics of raw material for decorative stone in Suoi Giang area (Yen Bai) and Sa Nghia area (Kon Tum) / Giang Nguyen Khac, Wojciech SMOLIŃSKI, Lucyna NATKANIEC-NOWAK, Magdalena DUMAŃSKA-SŁOWIK, Piotr Gunia, Ban to Xuan, Tu Le Thi Ngoc, Van Anh Pham Thi, Lieu Le Thi Thu, Son La Mai // W: POL-VIET 2019 : scientific-research cooperation between Poland and Vietnam : [5th international conference : 8–10 July 2019, Krakow] : abstracts, Vol. 1. — Kraków : [AGH], 2019. — ISBN: 978-83-943772-3-6. — S. 49