Abd GF, Zaboon RA. Solution of Time-Varying Index-2 Linear Differential Algebraic Control Systems Via A Variational Formulation Technique. Iraqi Journal of Science [Internet]. 2021 Oct. 30 [cited 2026 Jan. 4];62(10):3656-71. Available from: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/3998