@article{LavrenkoOkatovaSchulz1998,
  author    = {Peter N. Lavrenko and Olga V. Okatova and Burkhard Schulz},
  title     = {Stability and degradation of poly(p-pheneylene-1,3,4-oxadiazole) molecules in sulphuric acid},
  year      = {1998},
}