“Relative controllability of neutral semilinear$(k,\chi)$-Hilfer fractional integro-differential systemswith nonlocal initial conditions” (2026) Nonlinear Studies, 33(3), pp. 895–908. Available at: https://nonlinearstudies.com/index.php/nonlinear/article/view/4400 (Accessed: 31 August 2026).