Fig. 1
Spatial and temporal distribution of global research hotspots on phase separation in the field of oncology.
A Unsupervised learning hierarchical clustering for global research hotspots. The same colored nodes represent the same cluster. The size of the node indicates the total linkage strength. B Time series analysis of global research hotspots. A darker purple indicates a smaller average publication year, while a darker yellow indicates a bigger average publication year. C Spatial density network based on total linkage strength. D Spatial density network based on occurrence frequency.