Celebratio Mathematica

J. S. Birman and C. Series: “Dehn’s al­gorithm re­vis­ited, with ap­plic­a­tions to simple curves on sur­faces,” pp. 451–​478 in Com­bin­at­or­i­al group the­ory and to­po­logy (Alta Lodge, UT, 15–18 Ju­ly 1984). Edi­ted by S. M. Ger­sten and J. R. Stallings. An­nals of Math­em­at­ics Stud­ies 111. Prin­ceton Uni­versity Press, 1987. MR 895628 Zbl 0624.​20033 incollection