@Article{ref1,
title="Earth Observations and Remote Sensing; New Findings from Peking University in Earth Observations and Remote Sensing Provides New Insights (Validating GEOV1 Fractional Vegetation Cover Derived From Coarse-Resolution Remote Sensing Images Over Croplands)",
journal="Journal of Engineering",
year="2015 <meta name=``ValidationSchema'' content=``http://www.w3.org/2002/08/xhtml/xhtml1",
month="strict.xsd``> <title>{\&}nbsp;</title>"
}

@Article{ref2,
issn="1945--8711"
}