Impurity control in toroidal devices : proceedings of a technical ... held in Naka-Gun, Japan, 13-15 February 1989 / organized by The International Atomic Energy Agency. - Vienna : International Atomic Energy Agency, 1990. - 173 p. : ill. ; 28 cm. ISBN: 3610114289 Subjects--Topical Terms: Contamination (Technology).Toroidal harmonics.