Virtual HLF 2020 - Scientific Dialogue: Robert Endre Tarjan/Donald Ervin Knuth 

Does anyone know what paper Knuth is referring to at 39:50?

What a pleasure to see these two exceptional individuals exchange! If you are interested in Bob's thoughts on the Digital Transformation, join me for the last day of the HLF2018 in the garden of the SAP St. Leon Roth campus: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8KbNi_2BW4o.html