@article{ref1,
title="Occurrence of pulp canal obliteration after luxation injuries in the permanent dentition",
journal="Endodontics and dental traumatology",
year="1987",
author="Andreasen, F. M. and Zhijie, Y. and Thomsen, B. L. and Andersen, Per Kragh",
volume="3",
number="3",
pages="103-115",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0109-2502",
doi="",
url="http://dx.doi.org/"
}