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Îðèãèíàë: Ðàéçåð Þ Ï «Ïèñüìî â ðåäàêöèþ „Óñïåõîâ ôèçè÷åñêèõ íàóê“» ÓÔÍ 101 569–569 (1970); DOI: 10.3367/UFNr.0101.197007q.0569
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