@BOOK{NAP12420, title = "Working Group on Problems of Weightlessness in Space Flight", doi = "10.17226/12420", url = "https://nap.nationalacademies.org/catalog/12420/working-group-on-problems-of-weightlessness-in-space-flight", year = 1963, publisher = "The National Academies Press", address = "Washington, DC" }