1. Falkiewicz A, Falkiewiczowa S, Knapikowa D, Knapik Z, Kwiatkowski S, Rudkowska A, Sanak A, Smolik R, Weiss B, Zabiega A (1969) The vibratorius disease of the miners in Legnica-Glogów copper region. PZWL, Warsaw [in Polish]
2. Grzegorczyk L, Walaszek M (1972) Mechanical vibrations and their influence on the human. PZWL, Warsaw [in Polish]
3. Jain A, Waller W (1978) On the optimal number of features in the classification of multivariate Gaussian data, pattern recognition, vol 10, pp 365–374
4. Kanal L (1974) Patterns in pattern recognition. IEEE Trans on Information Theory, vol IT-6, pp 697–722
5. Knapikowa D, Halawa B (1975) Isotopic investigation of the capillary flow in persons exposed to the local action of mechanical vibration. Medycyna Pracy, vol XXVI, pp 101–104 [in Polish]