Oil shale ash : its characterization and possible use in remediation at the Sillamäe siteLaur, Toomas; Kikas, VernerTurning a problem into a resource : remediation and waste management at the Sillamäe site, Estonia2000 / p. 207-213 : illhttps://link.springer.com/chapter/10.1007/978-94-011-4092-8_25