@article{ref1,
title="The effect of traumatic injuries to primary teeth on their permanent successors. II. A clinical and radiographic follow-up study of 213 teeth",
journal="Scandinavian journal of dental research",
year="1971",
author="Andreasen, J. O. and Ravn, J. J.",
volume="79",
number="4",
pages="284-294",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0029-845X",
doi="",
url="http://dx.doi.org/"
}