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S. Mac Lane: “Co­her­ence the­or­ems and con­form­al field the­ory,” pp. 321–​328 in Cat­egory the­ory 1991 (Montreal, 23–30 June 1991). Edi­ted by R. A. G. Seely. CMS Con­fer­ence Pro­ceed­ings 13. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1992. MR 1192155 Zbl 0789.​18006 incollection

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