Statistical Analysis of the Sum of Double Random Variables for Security Applications in RIS-Assisted NOMA Networks with a Direct Link Authors Sang-Quang Nguyen, Phuong T. Tran, Bui Vu Minh, Tran Trung Duy, Anh-Tu Le, Lubos Rejfek and Lam-Thanh Tu Publication year 2025 Index (WoS/Scopus) WoS Publisher MDPI Journal Electronics Link https://www.mdpi.com/2079-9292/14/2/392