@BOOK{NAP12379, title = "Strategy for Exploration of the Inner Planets: 1977-1987", doi = "10.17226/12379", url = "https://nap.nationalacademies.org/catalog/12379/strategy-for-exploration-of-the-inner-planets-1977-1987", year = 1978, publisher = "The National Academies Press", address = "Washington, DC" }