Celebratio Mathematica

K. L. Chung: “An er­god­ic the­or­em for sta­tion­ary Markov chains with a count­able num­ber of states,” pp. 568 in Pro­ceed­ings of In­ter­na­tion­al Con­gress of Math­em­aticians (Cam­bridge, MA, Au­gust 30–Septem­ber 6, 1950). Edi­ted by L. M. Graves, E. Hille, P. A. Smith, and O. Za­r­iski. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1952. incollection