Homotopy and isotopy in dimension three. Joel Hass; Peter Scott — 1993 Commentarii mathematici Helvetici
Regular neighbourhoods and canonical decompositions for groups. Scott, Peter; Swarup, Gadde A. — 2002 Electronic Research Announcements of the American Mathematical Society [electronic only]
Splittings of groups and intersection numbers. Scott, Peter; Swarup, Gadde A. — 2000 Geometry & Topology