@article{ref1,
title="Gravitational stress field around a tunnel in soft ground: Discussion",
journal="Canadian geotechnical journal",
year="1970",
author="Schmidt, Birger",
volume="7",
number="3",
pages="346-348",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0008-3674",
doi="10.1139/t70-045",
url="http://dx.doi.org/10.1139/t70-045"
}