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- [42] DETERMINATION OF MEDIUM TIME SCALE IONIZATION EFFECTS AT VARIOUS ALTITUDES IN THE STRATOSPHERE AND TROPOSPHERE DURING GROUND LEVEL ENHANCEMENT DUE TO SOLAR COSMIC RAYS ON 13.12.2006 (GLE 70) COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES, 2015, 68 (11): : 1425 - 1430