Celebratio Mathematica

D. L. Burk­hold­er and R. F. Gundy: “Dis­tri­bu­tion func­tion in­equal­it­ies for the area in­teg­ral,” pp. 527–​544 in Col­lec­tion of art­icles hon­or­ing the com­ple­tion by Ant­oni Zyg­mund of 50 years of sci­entif­ic activ­ity, VI, published as Stu­dia Math. 44 : 6. Państ­wowe Wydawn­ict­wo Naukowe (Warsaw), 1972. MR 340557 Zbl 0219.​31009 incollection

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