au.\*:("VIRTAPERKO L")
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CONSTRUCTION OF A ROTATING COIL MAGNETOMETER.KELHA V; VIRTAPERKO L.1975; ACTA POLYTECH. SCAND., PHYS. INCLUDG NUCLEON.; SUEDE; DA. 1975; NO 106; PP. 1-26; BIBL. 8 REF.; ISBN 9516660541Serial Issue
CONSTRUCTION OF DEMAGNETIZING COILS FOR BENEFICIATION PROCESSES.KELHA V; VIRTAPERKO L.1976; ACTA POLYTECH. SCAND., APPL. PHYS.; FINL.; DA. 1976; NO 115; PP. 1-28; BIBL. 10 REF.; ISBN 9516660762Serial Issue
STUDIES ON RUNNABILITY PROBLEMSLINDQVIST U; JANTUNEN J; LINNA H et al.1983; PAPERI JA PUU; ISSN 0031-1243; FIN; DA. 1983; VOL. 65; NO 4; PP. 305-312; 5 P.; ABS. FIN; BIBL. 9 REF.Article