1. Goldman HM, in Periodontia, third ed., C. V. Mosby Co, St Louis, pages 552–61, 1953.
2. Wennstromm JL, Pin Prato GP, Mucogingival therapy-periodontal plastic surgery, in Clinical periodontology and implant dentistry, Lindhe J, Karring T, Lang NP, eds., fourth ed., Blackwell Publishing Co., Blackwell Munksgard, pages 576–649, 2003.