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Baris 57: {{Reflist}}<!--added under references heading by script-assisted edit--> * {{cite journal \|author=Poluboyarinova-Kochina, P. Ya. \|year=1964 \|title=Aleksandr Fridman \|url=http://www.iop.org/EJ/article/0038-5670/6/4/E01/PHU_6_4_E01.pdf?request-id=7429cf76-2dd8-4055-87c8-fa001c02acd1 \|journal=Soviet Physics Uspekhi (English edition) \|month=January–February \|pages=467–472\|ref=harv}} * {{cite book \|title=Stephen Hawking: Quest For A Theory of Everything \|last=Ferguson \|first=Kitty \|authorlink= \|coauthors= \|year=1991 \|publisher=Bantam Books \|location=New York \|isbn=0-553-29895-X \|pages= \|ref=harv}} * {{cite journal\|journal=Soviet Physics Uspekhi\|volume=31\|issue=7\|first=V.Ya.\|last= Frenkel'\|year=1988\|page=645–665\|doi=10.1070/PU1988v031n07ABEH003574\|title=Aleksandr Aleksandrovich Fridman (Friedmann): a biographical essay\|bibcode = 1988SvPhU..31..645F }}

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