KALIS, Harijs, and Ilmārs KANGRO. Effective Finite Difference and Conservative Averaging Methods for Solving Problems of Mathematical Physics. Rēzekne, Latvia: Rēzeknes Tehnoloģiju akadēmija, 2021. Accessed November 21, 2024. https://books.rta.lv/index.php/RTA/catalog/book/24.