Does anyone have a good resource on this family of languages or otherwise on any of them individually? Every time I've run across references to K/Q I've poked a

Does anyone have a good resource on this family of languages or otherwise on any of them individually? Every time I've run across references to K/Q I've poked around a bit and it feels like they kind of exist as linguistic curiosities in some vacuum with a vaguely unexplained creation myth about a man named Whitney. Edit: found this paper which appears to be around the birth of array languages by the developer of APL. http://www.jsoftware.com/papers/tot.htm http://www.jsoftware.com/papers/tot.htm