@BOOK{NAP19423, title = "Proceedings of a Symposium on District Heating and Cooling: Preprint", doi = "10.17226/19423", url = "https://nap.nationalacademies.org/catalog/19423/proceedings-of-a-symposium-on-district-heating-and-cooling-preprint", year = 1984, publisher = "The National Academies Press", address = "Washington, DC" }