@article{ref1,
title="Significance of acoustic signals in navigation",
journal="Biuletyn Instytutu Medycyny Morskiej w Gda'nsku",
year="1966",
author="Lessing, G.",
volume="17",
number="3",
pages="267-275",
abstract="<p>[Abstract unavailable]</p> <p>Language: de</p>",
language="de",
issn="0020-4463",
doi="",
url="http://dx.doi.org/"
}