Country City Number of citations in papers Population Density
France Paris 3 2.2 million inhab. 20,980 inhab./km²
Spain Barcelona 1 1.6 million inhab. 15,895 inhab./km²
Brazil Belo Horizonte 1 2.5 million inhab. 7,561 inhab./km²
Japan Tokyo 2 13 million inhab. 6,354 inhab./km²
Spain Valence 1 792 thousand inhab. 5,844 inhab./km²
India New Delhi 1 250 thousand inhab. 5,720 inhab./km²
Netherlands Amsterdam 1 779 thousand inhab. 4,908 inhab./km²
Austria Vienna 1 1.7 million inhab. 4,069 inhab./km²
Germany Berlin 3 4.1 million inhab. 3,848 inhab./km²
Italy Padua 1 210 thousand inhab. 2,267 inhab./km²
Germany Erfurt 1 206 thousand inhab. 754 inhab./km²
England Newcastle 1 259 thousand inhab. 719 inhab./km²
Italy Parma 1 178 thousand inhab. 601 inhab./km²
Italy Lucca 1 87 thousand inhab. 431 inhab./km²
Australia Sidney 1 4.7 million inhab. 391 inhab./km²
England Cambridge 1 123 thousand inhab. 307 inhab./km²