Nguyen Van Tuan, Hoang Tuan Nghia, Nguyen Cong Thang, Cu Viet Hung, Keun-Hyeok Yang and Pham Sy Dong 2021. EXPERIMENTAL STUDY TO PRODUCE MANHOLE COVER USING ULTRA-HIGH PERFORMANCE CONCRETE. GEOMATE Journal. 21, 85 (Sep. 2021), 91–98.