au.\*:("KATAJA E")
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MAGNETIC RESULTS SODANKYLAE 1978 = RESULTATS D'OBSERVATIONS MAGNETIQUES SODANKYLAE 1978KATAJA E.1979; VERAEFF. GEOPHYS. OBS. FINN. AKAD. WISS.; ISSN 0355-0826; FIN; DA. 1979; NO 64; 32 P.Serial Issue
IMF POLARITY AND ANNUAL VARIATIONS OF THE DST INDEXOKSMAN J; KATAJA E.1981; GEOPHYS. J. R. ASTRON. SOC.; ISSN 0016-8009; GBR; DA. 1981; VOL. 65; NO 3; PP. 603-609; BIBL. 20 REF.Article
An extension of the geomagnetic activity index series aa for two solar cycles (1844-1868)NEVANLINNA, H; KATAJA, E.Geophysical research letters. 1993, Vol 20, Num 23, pp 2703-2706, issn 0094-8276Article
Hemispheric asymmetry of the sun suggested by the annual variation of the aa indexOKSMAN, J; KATAJA, E.Annales geophysicae. Series A. Upper atmosphere and space sciences. 1986, Vol 4, Num 1, pp 69-73Article