TY - JOUR AU - G. M. Martynkevich TI - On the nature and mechanisms of $17^+$, $18^+$, $19^+$, and $44^+$ ion formation in the upper atmosphere JO - Doklady Akademii Nauk PY - 1975 SP - 72 EP - 75 VL - 222 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1975_222_1_a14/ LA - ru ID - DAN_1975_222_1_a14 ER -