References are in the (i) info link in bottom right:
Asteroid Impact Risk (https://eprints.soton.ac.uk/412703/)
Earth Impact Effects Program (https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/effects.pdf)
Population Vulnerability Models for Asteroid Impact Risk Assessment (https://www.researchgate.net/publication/313857682_Population_Vulnerability_Models_for_Asteroid_Impact_Risk_Assessment)
The Effects of Nuclear Weapons, Third Edition (https://www.osti.gov/biblio/6852629)
FEMA Explosive Blast (https://www.fema.gov/pdf/plan/prevent/rms/426/fema426_ch4.pdf)
Gridded Population of the World (GPW), v4 (https://sedac.ciesin.columbia.edu/data/collection/gpw-v4)