Celebratio Mathematica

N. El Ka­roui, E. Par­doux, and M. Yor: Stochast­ic fil­ter­ing at Saint-Flour (Saint-Flour, France, 1979). Prob­ab­il­ity at Saint-Flour. Spring­er (Heidel­berg), 2012. Re­print of lec­tures ori­gin­ally pub­lished in Ecole d’eté de prob­ab­ilités de Saint-Flour IX–1979 (1981), in­clud­ing Yor’s con­tri­bu­tions. MR 3075395 Zbl 05993935 book