They don't cite[0] quite possibly because they independently discovered it as did others like L.P. Deutsch (who sometimes is prepended as Deutsch, Schorr, Waite

They don't cite[0] quite possibly because they independently discovered it as did others like L.P. Deutsch (who sometimes is prepended as Deutsch, Schorr, Waite). It stands out for me as something I ended up working out as an improvement for an implementation of LispKit Lisp[1] sometime around 1982. Imagine my surprise when I came across a reference to DSW describing my 'little pointer trick' :-) [0] https://xlinux.nist.gov/dads/HTML/SchorrWaiteGraphMarking.html https://xlinux.nist.gov/dads/HTML/SchorrWaiteGraphMarking.ht... [1] https://en.wikipedia.org/wiki/Lispkit_Lisp https://en.wikipedia.org/wiki/Lispkit_Lisp