Wie korriegere ich den Abstand, Leerzeichen einfügen, in der Literaturausgabe?

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@BOOK{Heringer1974,
  author = {Hans Jürgen Heringer},
  shortauthor = {Heringer},
  gender = {sm},
  title = {Praktische Semantik},
  year = {1974},
  publisher = {Klett},
    location = {Stuttgart},    
}

@BOOK{Scherer2014,
  author = {Carmen Scherer},
  shortauthor = {Scherer},
  gender = {sf},
  title = {Korpuslinguistik},
  year = {2014},
  publisher = {Winter},
  number = {2},
  series = {Kurze Einführungen in die Germanistische Linguistik},
  edition = {2},
  location = {Heidelberg},
  editor = {Jörg Meibauer and Markus Steinbach},
}

@BOOK{Heringer1977,
  author = {Hans Jürgen Heringer},
  shortauthor = {Heringer},
  gender = {sm},
  title = {Einführung in die praktische Semantik},
  shorttitle = {Praktische Semantik (2)},
  year = {1977},
  publisher = {Quelle und Mayer},
    location = {Heidelberg},    
}

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\fullcite{Heringer1977} and \fullcite{Heringer1974} and \fullcite{Scherer2014}

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