Gray langurs optimizer: a multi-group bio-inspired optimization algorithm. - Barshandeh, Saeid; Khodadadi, Nima; Abdollahzadeh, Benyamin; Mohammadzadeh, Ali; El-Kenawy, El-Sayed M.; Eid, Marwa M.; Mosalam, Khalid M. (Artificial Intelligence Review, 2026)