Belrzaeg, M. و A. Masood, M. (2022) "Overview of the Cryogenic Refrigeration Systems", African Journal of Advanced Pure and Applied Sciences (AJAPAS), 1(2), ص 24–34. موجود في: https://aaasjournals.com/index.php/ajapas/article/view/40 (تاريخ الوصول: 3 يوليو 2024).