Celebratio Mathematica

D. L. Burk­hold­er: “A geo­met­ric con­di­tion that im­plies the ex­ist­ence of cer­tain sin­gu­lar in­teg­rals of Banach-space-val­ued func­tions,” pp. 270–​286 in Con­fer­ence on har­mon­ic ana­lys­is in hon­or of Ant­oni Zyg­mund (Chica­go, 23–28 March 1981), vol. 1. Edi­ted by W. Beck­ner, A. P. Calder­ón, R. Fef­fer­man, and P. W. Jones. Wadsworth Math­em­at­ics Series. Wadsworth (Bel­mont, CA), 1983. MR 730072 incollection

D. L. Burk­hold­er: “Some ex­tremal prob­lems in mar­tin­gale the­ory and har­mon­ic ana­lys­is,” pp. 99–​115 in Har­mon­ic ana­lys­is and par­tial dif­fer­en­tial equa­tions: Es­says in hon­or of Al­berto P. Calderón (Chica­go, Feb­ru­ary 1996). Edi­ted by M. Christ, C. E. Kenig, and C. Sa­d­osky. Chica­go Lec­tures in Math­em­at­ics. Uni­versity of Chica­go Press, 1999. Es­says in hon­or of Calderón’s 75th birth­day. MR 1743857 Zbl 0954.​60034 incollection

D. L. Burk­hold­er: “Com­ments on (5), (14), (22), (30), and (31),” pp. 553–​558 in Se­lec­ted pa­pers of Al­berto P. Calderón with com­ment­ary. Edi­ted by A. Bel­low, C. E. Kenig, and P. Malliavin. AMS Col­lec­ted Works 21. Amer­ic­an Math­ema­tial So­ci­ety (Provid­ence, RI), 2008. MR 2435333 incollection