[1] leafletjs (201X) Leaflet Quick Start Guide, retrieved from December 28, 2016 from http://leafletjs.com/examples/quick-start/
[2] leafletjs (201X) Using GeoJSON with Leaflet, retrieved from September 28, 2017 from http://leafletjs.com/examples/geojson/
[3] MacWright, T (2015) More than you ever wanted to know about GeoJSON