"NATO CALS Handbook". CiteSeerX. March 1, 2000. CiteSeerX 10.1.1.194.9777. Archived from the original on 2023-07-02. Retrieved 2023-07-02. https://web.archive.org/web/20230702093453/https://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=EFE057346A17A50FB2A4A04A067FC862?doi=10.1.1.194.9777&rep=rep1&type=pdf