Erken, Irem Küpelı2026-02-122026-02-1220182147-6268https://hdl.handle.net/20.500.12885/6521The object of the present paper is to study some classes of 3-dimensional quasi-para-Sasakian manifoldswith ? =const. We investigated 3-dimensional quasi-para-Sasakian manifolds with ? =const. satisfyingthe curvature conditions P.Q = 0, Q.P = 0, P.R = 0, where P is the projective curvature tensor, Q isthe Ricci operator and R is the Riemannian curvature tensor. Also, a 3-dimensional concircularly flatquasi-para-Sasakian manifold with ? =const. is studied. Finally, an example of 3-dimensional properquasi-para-Sasakian manifold with ? =const. is given.eninfo:eu-repo/semantics/openAccessMatematikArticle625765399939