@article{ref1,
title="Transportation and combination",
journal="Science",
year="1906",
author="Knapp, M. A.",
volume="23",
number="579",
pages="178-184",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0036-8075",
doi="10.1126/science.23.579.178",
url="http://dx.doi.org/10.1126/science.23.579.178"
}