http://untappedcities.com/2013/08/09/the-beijing-that-never-was-a-two-center-beijing-under-the-1950-liang-chen-proposal/

http://untappedcities.com/2013/08/09/the-beijing-that-never-was-a-two-center-beijing-under-the-1950-liang-chen-proposal/