instruction: Which notable people in this list with surname Liebers were born in the 80s?
context: Liebers is a German language surname. Notable people with the name include:
  
  Mario Liebers (born 1960), German former competitive figure skater
  Martin Liebers (born 1985), German former competitive figure skater
  Matthias Liebers (born 1958), former German footballer
  Peter Liebers (born 1988), German former figure skater.
response: Martin Liebers and Peter Liebers