Generalized Inner Structure Spaces: Indefinite Sesquilinear Forms in Fréchet Spaces and Their Applications. Eur. J. Pure Appl. Math. [Internet]. 2026 Feb. 16 [cited 2026 Feb. 17];19(1):6727. Available from: https://www.ejpam.com/index.php/ejpam/article/view/6727