@BOOK{NAP19075, title = "Clean Coal Utilization: Papers From a Conference, December 1987", doi = "10.17226/19075", url = "https://nap.nationalacademies.org/catalog/19075/clean-coal-utilization-papers-from-a-conference-december-1987", year = 1989, publisher = "The National Academies Press", address = "Washington, DC" }