Solving a non‐standard Optimal Control royalty payment problem using a new modified shooting method. - Sufahani, Suliadi Firdaus; Ahmad, Wan Noor Afifah Wan; Jacob, Kavikumar; Shafie, Sharidan; Rahim, Ruzairi Abdul; Mohamad, Mahmod Abd Hakim; Rusiman, Mohd Saifullah; Roslan, Rozaini; Maarof, Mohd Zulariffin Md; Kamarudin, Muhamad Ali Imran (Mathematical Methods in the Applied Sciences, 2025)