A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
Cheng-Mei Yang, Yao-Dung Hsieh, Shue-Fen Yang. "Refractory apical periodontitis associated with a calculus-like deposit at the root apex." Journal of Dental Sciences 5.2 (2010) 109-113