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when toggle format what by license comment
Jul 10, 2018 at 2:12 history edited Alexey Ustinov CC BY-SA 4.0
added 29 characters in body
Jul 9, 2018 at 20:58 comment added Sergei There is a book of Kuznetsov in Russian on his formula.
Jul 9, 2018 at 16:59 history answered Sergei CC BY-SA 4.0