If you are looking for the academic research that describes the vulnerabilities such tools exploit, the most influential paper is likely: Ramayana The Legend Of Prince Rama Imdb Updated [BEST]
Because "gsmcrackguru" is typically associated with software utilities rather than a single academic paper, there is no specific academic paper by that exact title. However, the tool is generally based on the principles described in foundational cryptography and security research regarding the A5/1 encryption algorithm used in GSM networks. 50 First Dates Me Titra Shqip [FAST]