Celebratio Mathematica

K. Hoff­man and I. M. Sing­er: “Max­im­al sub­al­geb­ras of \( C(\Gamma) \),” Amer. J. Math. 79 : 2 (April 1957), pp. 295–​305. MR 85478 Zbl 0078.​11001 article

K. Goff­man and I. M. Zinger: “Some prob­lems of Gel’fand,” Us­pehi Mat. Nauk 14 : 3(87) (1959), pp. 99–​114. An Eng­lish ver­sion was pub­lished in Eight­een pa­pers on al­gebra (1963). MR 117538 Zbl 0154.​38502 article

K. Hoff­man and I. M. Sing­er: “Max­im­al al­geb­ras of con­tinu­ous func­tions,” Acta Math. 103 : 3–​4 (1960), pp. 217–​241. MR 117540 Zbl 0195.​13903 article

K. Hoff­man and I. M. Sing­er: “On some prob­lems of Gel’fand,” pp. 143–​157 in Eight­een pa­pers on al­gebra. Amer­ic­an Math­em­at­ic­al So­ci­ety Trans­la­tions. Series 2 27. 1963. Trans­la­tion of Rus­si­an ori­gin­al pub­lished in Us­pehi Mat. Nauk 14:3(87) (1959). MR 151866 Zbl 0187.​38601 incollection

K. Hoff­man: “Fifty years of friend­ship and col­lab­or­a­tion with Sing­er,” pp. 269–​272 in The founders of in­dex the­ory: Re­min­is­cences of Atiyah, Bott, Hirzebruch, and Sing­er. Edi­ted by S.-T. Yau. In­ter­na­tion­al Press (Somerville, MA), 2009. incollection