https://www.doria.fi/bitstream/handle/10024/192931/ullah_aziz.pdf?sequence=2 Authors Published Date: 2025-06
https://ntnuopen.ntnu.no/ntnu-xmlui/handle/11250/3018625?locale-attribute=en Authors Published Date: 2022-06
https://dukespace.lib.duke.edu/items/38c12cfd-81b6-4af7-812a-e61ee52573d6 Authors Published Date: 2020