✓

@Book{            HardyWright:Numbers:2008,
  Author        = "Hardy, G. H. and Wright, E. M.",
  date-added    = "2020-04-10 11:07:26 +0200",
  date-modified = "2020-04-10 11:07:26 +0200",
  Edition       = "6ed.",
  ISBN          = "9787115214270",
  Publisher     = "OUP",
  Title         = "An introduction to the theory of numbers",
  URL           = "http://gen.lib.rus.ec/book/index.php?md5=70D59F7871FDDEBEF0495A0C0671161C",
  Year          = "2008",
  bdsk-url-1    = "http://gen.lib.rus.ec/book/index.php?md5=70D59F7871FDDEBEF0495A0C0671161C",
  File          = "[Hardy\_G.H.,\_Wright\_E.M.]\_An\_introduction\_to\_the\_t(b-ok.xyz) (0) - a - a.pdf",
  file-2        = "[Hardy\_G.H.,\_Wright\_E.M.]\_An\_introduction\_to\_the\_t(b-ok.xyz) (0) - a - a.djvu"
}

@Book{ HardyWright:Numbers:2008, Author = "Hardy, G. H. and Wright, E. M.", date-added = "2020-04-10 11:07:26 +0200", date-modified = "2020-04-10 11:07:26 +0200", Edition = "6ed.", ISBN = "9787115214270", Publisher = "OUP", Title = "An introduction to the theory of numbers", URL = "http://gen.lib.rus.ec/book/index.php?md5=70D59F7871FDDEBEF0495A0C0671161C", Year = "2008", bdsk-url-1 = "http://gen.lib.rus.ec/book/index.php?md5=70D59F7871FDDEBEF0495A0C0671161C", File = "[Hardy_G.H.,_Wright_E.M.]_An_introduction_to_the_t(b-ok.xyz) (0) - a - a.pdf", file-2 = "[Hardy_G.H.,_Wright_E.M.]_An_introduction_to_the_t(b-ok.xyz) (0) - a - a.djvu" }