AN SSSR, Moscow (USSR). Otdelenie Obshchej i Tekhnicheskoj Khimii; AN SSSR, Moscow (USSR). Nauchnyj Sovet po Neorganicheskoj Khimii; AN SSSR, Moscow (USSR). Nauchnyj Sovet po Probleme Analiticheskaya Khimiya; 452 p; 1991; p. 225; 9. All-union conference on extraction; Adler (USSR); 20-24 May 1991