@Misc{D.Lloret1999,
author="D. Lloret
and Joan Serrat",
title="System for calibration of a stereotatic frame.",
year="1999",
optnote="ADAS",
optnote="exported from refbase (http://refbase.cvc.uab.es/show.php?record=20), last updated on Mon, 27 Jun 2011 12:59:55 +0200"
}