Erskine-Murray, J. A handbook of wireless telegraphy : its cheory and practice : for the USE of electrical engineers, students, and operators / by James Erskine-Murray; J. Erskine-Murray .— : Crosby Lockwood and Son, 1907 .— 351 с. — Lang: eng .— URL: https://rucont.ru/efd/93231 (дата обращения: 13.11.2025)