Complex Economic Activities Concentrate in Large Cities. - Pierre-Alexandre Balland; Cristian Jara-Figueroa; Sergio Petralia; Mathieu P. A. Steijn; David Rigby; César A. Hidalgo 001 (CoRR, 2018)

Intercity connectivity and urban innovation. - Xiaofan Liang; César A. Hidalgo 001; Pierre-Alexandre Balland; Siqi Zheng; Jianghao Wang (Comput. Environ. Urban Syst., 2024)