Feasibility and first results of multimodality treatment, combining EBRT, extensive surgery, and IOERT in locally advanced primary rectal cancer - Mannaerts,G.H.; Martijn,H.; Crommelin,M.A.; Dries,W.; Repelaer van Driel,O.J.; Rutten,H.J. (Int J Radiat Oncol Biol Phys, 2000)