Celebratio Mathematica

H. Berestycki, L. Niren­berg, and S. Varadhan: “État fon­da­ment­al et prin­cipe du max­im­um pour les opérat­eurs el­lipt­iques du second or­dre dans des do­maines généraux,” C. R. Acad. Sci. Par­is Sér. I Math. 317 : 1 (1993), pp. 51–​56. MR 1228964 Zbl 0798.​35038 article

H. Berestycki, L. Niren­berg, and S. R. S. Varadhan: “The prin­cip­al ei­gen­value and max­im­um prin­ciple for second-or­der el­lipt­ic op­er­at­ors in gen­er­al do­mains,” Comm. Pure Ap­pl. Math. 47 : 1 (1994), pp. 47–​92. MR 1258192 Zbl 0806.​35129 article

S. R. S. Varadhan: “Particle sys­tems and par­tial dif­fer­en­tial equa­tions,” pp. 217–​222 in Lec­tures on par­tial dif­fer­en­tial equa­tions: Pro­ceed­ings in hon­or of Louis Niren­berg’s 75th birth­day. Edi­ted by S.-Y. A. Chang, C.-S. Lin, and H.-T. Yau. New Stud­ies in Ad­vanced Math­em­at­ics 2. In­ter­na­tion­al Press (Somerville, MA), 2003. MR 2055850 Zbl 1167.​82351 incollection