Celebratio Mathematica

J. Hass, J. H. Ru­bin­stein, and S. Wang: “Bound­ary slopes of im­mersed sur­faces in 3-man­i­folds,” J. Diff. Geom. 52 : 2 (1999), pp. 303–​325. MR 1758298 Zbl 0978.​57016 ArXiv math/​9911072 article

J. Hass, S. Wang, and Q. Zhou: “On fi­nite­ness of the num­ber of bound­ary slopes of im­mersed sur­faces in 3-man­i­folds,” Proc. Am. Math. Soc. 130 : 6 (2002), pp. 1851–​1857. MR 1887034 Zbl 0993.​57007 article