@article{ref1,
title="Distribution of natural missiles resulting from cratering explosions in hard rock",
journal="Annals of the New York Academy of Sciences",
year="1968",
author="Henny, R. W. and Carlson, R. H.",
volume="152",
number="1",
pages="404-431",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}