H. KALIS and I. KANGRO, Effective Finite Difference and Conservative Averaging Methods for Solving Problems of Mathematical Physics. Rēzekne, Latvia: Rēzeknes Tehnoloģoju akadēmija, 2021. Accessed: Sep. 08, 2024. [Online]. Available: https://books.rta.lv/index.php/RTA/catalog/book/24