@BOOK{NAP12324, title = "On the Proposed Redesign of Space Station Freedom: Letter Report", doi = "10.17226/12324", url = "https://nap.nationalacademies.org/catalog/12324/on-the-proposed-redesign-of-space-station-freedom-letter-report", year = 1991, publisher = "The National Academies Press", address = "Washington, DC" }