TY - BOOK AU - Aharonian,F.A. AU - Kanevsky,B.L. AU - Vardanian,V.V. TI - Interaction of ultrahigh energy cosmic rays with microwave background radiation: T2 - ЕФИ-1135(12)-89 PY - 1989/// CY - Yerevan PB - Yerevan Physics Institute KW - Physics ER -