https://en.wikipedia.org/wiki/Tour_Montparnasse ,
https://skyrisecities.com/news/2017/09/infamous-tour-montparnasse-undergo-major-facelift ,
https://skyrisecities.com/database/projects/tour-montparnasse-revitalization ,
https://www.designboom.com/architecture/studio-gang-montparnasse-tower-competition-paris-09-26-2017 ,
https://skyrisecities.com/news/2016/10/architects-compete-overhaul-paris-controversial-tour-montparnasse ,
http://www.skyscrapercenter.com/building/tour-montparnasse/1487 ,
https://en.wikipedia.org/wiki/List_of_tallest_buildings_and_structures_in_the_Paris_region ,
https://en.wikipedia.org/wiki/Montparnasse_%E2%80%93_Bienven%C3%BCe_(Paris_M%C3%A9tro)#History ,
https://jf-databits.blogspot.com/search?q=urban+rail
