A competitive optimization approach for data clustering and orthogonal non-negative matrix factorization. - Ja'far Dehghanpour-Sahron; Nezam Mahdavi-Amiri (4OR, 2021)

Orthogonal nonnegative matrix factorization problems for clustering: A new formulation and a competitive algorithm. - Ja'far Dehghanpour; Nezam Mahdavi-Amiri (Ann. Oper. Res., 2024)