There's many more. At this point there's a pretty good set of studies on transmission data. It seems to all indicate that proximity to other infected people increases risk of transmission, and that contact of contaminated surfaces or others is not necessary. Then you can see that transmission in the air in aerosol and droplets are both possible, and then you can reason about this with the physics on them. The closer to someone else breathing the more virus particle is in the air for you to breathe, the further away, the less of it. The more ventilated the place you are in, the less you breath in other people's air.
The CDC also does a great job at being transparent about their assessment and sources. Read those, and if you scroll down on each page you'll see large list of reference to the studies they've based their assessment on.
https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
https://www.pnas.org/content/117/22/11875
https://www.sciencedirect.com/science/article/pii/S016041202...
https://pubmed.ncbi.nlm.nih.gov/33664169/
https://pubmed.ncbi.nlm.nih.gov/33712573/
There's many more. At this point there's a pretty good set of studies on transmission data. It seems to all indicate that proximity to other infected people increases risk of transmission, and that contact of contaminated surfaces or others is not necessary. Then you can see that transmission in the air in aerosol and droplets are both possible, and then you can reason about this with the physics on them. The closer to someone else breathing the more virus particle is in the air for you to breathe, the further away, the less of it. The more ventilated the place you are in, the less you breath in other people's air.
The CDC also does a great job at being transparent about their assessment and sources. Read those, and if you scroll down on each page you'll see large list of reference to the studies they've based their assessment on.
https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...
https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...
https://www.cdc.gov/coronavirus/2019-ncov/more/science-and-r...
https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...
https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...