usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}

usepackage[style=alphabetic,
  mcite=true,
  subentry,
  maxcitenames=3,
  backend=biber
  ]{biblatex}

makeatletter
    % warning the file called blxmset@bibfile@name will be
    % overwritten without warning
    defblxmset@bibfile@name{jobname -msets.bib}
    newwriteblxmset@bibfile
    immediateopenoutblxmset@bibfile=blxmset@bibfile@name

    AtEndDocument{%
      closeoutblxmset@bibfile}

    newrobustcmd*{defbibentrysetlabel}[3]{%
      @bsphack
      begingroup
      immediatewriteblxmset@bibfile{%
        @set{#1, entryset = {unexpanded{#3}}, %
              shorthand = {unexpanded{#2}},}%
      }%
      nocite{#1}%
      @esphack}

    addbibresource{blxmset@bibfile@name}
makeatother

usepackage{filecontents}
begin{filecontents}{jobname.bib}
@book{Yvon_1935,
  title     = {La Th'eorie Statistique Des Fluides et l''equation d''etat},
  series    = {Actualit'es Scientifiques et Industrielles ; {Th'eories} M'ecaniques (Hydrodynamique-Acoustique)},
  publisher = {Hermann & cie},
  date      = {1935},
  author    = {Yvon, Jacques},
  lccn      = {37018772}
}
@article{Born_1946,
  title        = {A General Kinetic Theory of Liquids {I}. {The} Molecular Distribution Functions},
  volume       = {188},
  issn         = {2053-9169},
  doi          = {10.1098/rspa.1946.0093},
  number       = {1012},
  journaltitle = {Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences},
  date         = {1946-12-31},
  pages        = {10-18},
  author       = {Born, Max and Green, Herbert Sydney},
}
@article{Kirkwood_1946,
  title        = {The Statistical Mechanical Theory of Transport Processes {I}. {General} Theory},
  volume       = {14},
  url          = {http://aip.scitation.org/doi/10.1063/1.1724117},
  doi          = {10.1063/1.1724117},
  number       = {3},
  journaltitle = {The Journal of Chemical Physics},
  urldate      = {2019-01-16},
  date         = {1946-03},
  pages        = {180-201},
  author       = {Kirkwood, John Gamble},
}
@article{Bogolioubov_1945,
  title        = {Kinetic Equations},
  volume       = {10},
  number       = {3},
  journaltitle = {Journal of Physics USSR},
  date         = {1945},
  pages        = {265-274},
  author       = {Bogolioubov, Nikola"i Nikola"ievitch}
}
@article{Boncella_1984,
  author  = {Boncella, James M. and Andersen, Richard A.},
  journal = {Inorg. Chem.},
  pages   = {432--437},
  volume  = {23},
  year    = {1984},
}
end{filecontents}

addbibresource[datatype=bibtex]{jobname.bib}

documentclass{article}

input{preamble.tex}

begin{document}
    A first citation~cite{Boncella_1984}.
    And another that I want to cite as a set BBGKY45 defbibentrysetlabel{setBBGKY}{BBGKY45}{Yvon_1935,Bogolioubov_1945,Born_1946,Kirkwood_1946}cite{setBBGKY}.

    printbibliography
end{document}

documentclass{article}

input{preamble.tex}

usepackage{standalone}

begin{document}
    test3 cite{Boncella_1984}

    input{./test_include.tex}
end{document}