Guided tissue regeneration associated with bovine-derived anorganic bone in mandibular Casse II furcation defects: 6-month results at re-entry - Simonpietri-C, Jeannette J.; Novaes Júnior, Arthur Belém; Batista Júnior, Eraldo L.; Feres Filho, Eduardo J. (Journal of Periodontology, 2000)