@article{ref1,
title="Dynamics and structure of the population (as applied to Ecuador)",
journal="Revista ecuatoriana de higiene y medicina tropical",
year="1968",
author="Enderica Vélez, R.",
volume="25",
number="1",
pages="61-74",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0013-0745",
doi="",
url="http://dx.doi.org/"
}