heterogeneity 79 Research & information: general 65 Technology: general issues 61 human 38 History of engineering and technology 32 Biology, life sciences 31 China 29 Humans 29 Article 24 Research and information: general 23 Heterogeneity 21 Biodiesel 20 Chemistry 20 Medicine and Nursing 19 Spatial heterogeneity 17 Heterogeneous catalyst 16 female 14 Economics 13 Ecosystems 13 Heterogeneous networks 13 Inclusive education / mainstreaming 13 Environmental economics 12 Forecasting 12 Land use 12 controlled study 12 spatiotemporal analysis 12 genetics 11 male 11 procedures 11 Biodiversity 10