Haider عا. The essential relations in theorem of 2F mappings between Remannian spaces which have structure (F\(^3\) )=0. Univ. Aden J. Nat. and Appl. Sc. [Internet]. 2018 Apr. 30 [cited 2025 Apr. 3];22(1):51-8. Available from: https://uajnas.adenuniv.com/index.php/uajnas/article/view/159