@article{ref1,
title="Effects of terrain modeling on the collision risk estimation for precision approaches",
journal="Journal of air transportation (Reston, Va.)",
year="2019",
author="Gonzaga-López, Carlos",
volume="28",
number="1",
pages="23-27",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="2380-9450",
doi="10.2514/1.D0145",
url="http://dx.doi.org/10.2514/1.D0145"
}