@phdthesis{ömür, 
  title={The induce resistance against fire blight by the plant activator BTH (BION) or extract of Hedera helix leaves and studies on the mode of action}, 
  DOI={10.53846/goediss-1885}, 
  school={University Goettingen Repository}, 
  author={Ömür, Baysal}
  }