<https://secure.gravatar.com/avatar/4350b96625ec27c0794f6a05414eeea0?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://gutenberg-galaxis.hu/dr-ranschburg-jeno-rogok-az-uton-pdf/>