<https://www.deepdyve.com/lp/multidisciplinary-digital-publishing-institute/a-mixed-fso-rf-integrated-satellite-high-altitude-platform-relaying-AHScKe87DP>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://plosjournal.deepdyve.com/lp/multidisciplinary-digital-publishing-institute/a-mixed-fso-rf-integrated-satellite-high-altitude-platform-relaying-AHScKe87DP>