@article{ref1,
title="Comparing four different methods for measuring personal social networks",
journal="Social networks",
year="1990",
author="Bernard, H. Russell and Johnsen, Eugene C. and Killworth, Peter D. and McCarty, Christopher and Shelley, Gene A. and Robinson, Scott",
volume="12",
number="3",
pages="179-215",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0378-8733",
doi="10.1016/0378-8733(90)90005-T",
url="http://dx.doi.org/10.1016/0378-8733(90)90005-T"
}