@article{1861,
      author = {Schmied-kowarzik, Volker,},
      url = {http://tind.wipo.int/record/1861},
      title = {Ueber den Nachweis des technischen Fortschrittes bei  Chemie-Erfindungen /},
      recid = {1861},
      pages = {1 volume ([10] pages) ;},
}