STL-Lists

https://www.youtube.com/watch?v=a0BV1_hZ418

http://cplusplus.com/reference/list/list/

http://cplusplus.com/reference/stl/

https://stackoverflow.com/questions/5384358/how-does-a-sentinel-node-offer-benefits-over-null

https://cathyatseneca.gitbooks.io/data-structures-and-algorithms/content/lists