@article{ref1,
title="Estimation of the Number of Holes and Charge Per Round in Tunnel Drivage",
journal="OR: Operational research quarterly (1953)",
year="1957",
author="Mercer, A",
volume="8",
number="1",
pages="22-29",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1473-2858",
doi="",
url="http://dx.doi.org/"
}