Activity Concentrations of Sr-90 and Cs-137 in Seawater and Sediment in the Gulf of Tonkin, Vietnam oleh Trong-Ngo Nguyen, Quang-Thien Tran, Van-Phuc Nguyen, Nhu-Sieu Le, Son-Hai Phan, Xuan-Thang Le, Thi-Thu-Hang Vuong, Van-Phu Nguyen, Đinh-Tung Nguyen, Đinh-Khoa Tran, Minh-Đao Nguyen, Quang-Trung Phan, Thi-Mong-Tham Vo, Van-Thang Duong, Ngoc-Chung Le