@article{RatajskaStruszczykBoryniecetal.1997,
  author    = {Ratajska, M. and Struszczyk, Marcin Henryk and Boryniec, Stefan and Peter, Martin G. and Loth, Fritz},
  title     = {The degree of acetylation of chitosan : optimization of the IR Method},
  year      = {1997},
  language  = {en}
}
@article{StruszczykRatajskaBoryniecetal.1997,
  author    = {Struszczyk, Marcin Henryk and Ratajska, M. and Boryniec, Stefan and Peter, Martin G. and Loth, Fritz},
  title     = {The determination of the degree of N-acetylation of chitosan},
  year      = {1997},
  language  = {en}
}