@article{KleinpeterHilfertKoch2000,
  author    = {Kleinpeter, Erich and Hilfert, Liane and Koch, Andreas},
  title     = {GIAO-HF/DFT calculation of C-13 and N-15 chemical shifts for studying tautomerism and intramolecular hydrogen bonding in 2,3-disubstituted quinoxalines},
  year      = {2000},
  language  = {en}
}
@article{KleinpeterHilfertKoch1999,
  author    = {Kleinpeter, Erich and Hilfert, Liane and Koch, Andreas},
  title     = {NMR spectroscopic and ab-initio MO study of sterically hindered 2,3-disubstituted quinoxalines},
  year      = {1999},
  language  = {en}
}