The Collected Papers of Albert Einstein, Volume 10: The Berlin Years: Correspondence, May-December 1920, and Supplementary Correspondence, 1909-1920. Edited by Diana Kormos Buchwald, Tilman Sauer, Ze'ev Rosenkranz, Josef Illy & Virginia Iris Holmes
Max Plus at Work: Modeling and Analysis of Synchronized Systems: A Course on Max-Plus Algebra and Its Applications. Bernd Heidergott, Geert Jan Olsder, & Jacob van der Woude