| web | ScienceDaily | 2012-06-27 | ||
| web | Jenny Rissler, Erik Swietlicki | Journal of Aerosol Science | 2012-06-01 | |
| web | American Nonsmokers’ Rights Fo... | 2021-03-27 | ||
| web | Douglas Reed | The Conversation | 2020-06-16 | |
| web | Neeltje van Doremalen, Ph.D., ... | New England Journal of Medicin... | ||
| web | Ruth Reck | Science | 1975-05-01 |