Grammont, Laurence, Mario Ahues, and Hanane Kaboul. “An Extension of the Product Integration Method to L1 With Applications in Astrophysics”. Mathematical Modelling and Analysis 21, no. 6 (November 17, 2016): 774-793. Accessed November 22, 2024. https://jest.vgtu.lt/index.php/MMA/article/view/863.