C. Reit, H. G. Gröndahl: Application of statistical decision theory to radiographic diagnosis of endodontically treated teeth. In: Scandinavian journal of dental research. Band 91, Nummer 3, Juni 1983, S. 213–218, ISSN0029-845X. PMID 6576461
D. Orstavik, K. Kerekes, H. M. Eriksen: The periapical index: a scoring system for radiographic assessment of apical periodontitis. In: Endodontics & dental traumatology. Band 2, Nummer 1, Februar 1986, S. 20–34, ISSN0109-2502. PMID 3457698.
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C. Reit, H. G. Gröndahl: Application of statistical decision theory to radiographic diagnosis of endodontically treated teeth. In: Scandinavian journal of dental research. Band 91, Nummer 3, Juni 1983, S. 213–218, ISSN0029-845X. PMID 6576461
D. Orstavik, K. Kerekes, H. M. Eriksen: The periapical index: a scoring system for radiographic assessment of apical periodontitis. In: Endodontics & dental traumatology. Band 2, Nummer 1, Februar 1986, S. 20–34, ISSN0109-2502. PMID 3457698.