<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54ca69830b5d4_-_alt_engines_03_0810-lg-22300581.jpg>
<http://www.popularmechanics.com/cars/g195/5-alternative-engine-architectures/>