IInternational Journal of Theoretical Physics3/26/2026Advance Periodic Waves and Closed-Form Invariant Solutions for $$(2 + 1)$$-Dimensional Hyperbolic Nonlinear Schrödinger (HNLS) Equation via Two Efficient Mathematical ApproachesAmit Kumar·Ashwani Saharan·Dharmendra KumarRead at International Journal of Theoretical PhysicsTagsNonlinear Waves and SolitonsStatistical and Nonlinear Physics