Co-UWSN: Cooperative Energy-Efficient Protocol for Underwater WSNs. - Sheeraz Ahmed; Nadeem Javaid; Fakhri Alam Khan; Mehr Yahya Durrani; Armughan Ali; Anwar Shaukat; Muhammad Moid Sandhu; Zahoor Ali Khan; Umar Qasim (Int. J. Distributed Sens. Networks, 2015)