A consultant wrote: "When I investigated translating SAS to the WebFOCUS BI product
(based on a 4GL programming language), I personally considered some of the following SAS features as stumbling blocks" and he listed 11 items. "Business Intelligence Software". 2012-04-30.
Nick Rawlings (March 17, 2014). "The History of NOMAD: A Fourth Generation Language". IEEE Annals of the History of Computing. 36: 30–38. doi:10.1109/MAHC.2014.10. S2CID19419272.
"Synopsis FOCUS: File Definition describes the components of a Master File Description. Audience This course is for the data processing and business professional who uses FOCUS." "FOCUS: File Definition".
Nick Rawlings (March 17, 2014). "The History of NOMAD: A Fourth Generation Language". IEEE Annals of the History of Computing. 36: 30–38. doi:10.1109/MAHC.2014.10. S2CID19419272.
