Yuodelis RA, Weaver JD, Sapkos S (January 1973). "Facial and lingual contours of artificial complete crown restorations and their effects on the periodontium". The Journal of Prosthetic Dentistry. 29 (1): 61–6. doi:10.1016/0022-3913(73)90140-6. PMID4564800.
Yuodelis RA, Weaver JD, Sapkos S (January 1973). "Facial and lingual contours of artificial complete crown restorations and their effects on the periodontium". The Journal of Prosthetic Dentistry. 29 (1): 61–6. doi:10.1016/0022-3913(73)90140-6. PMID4564800.