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Organizácia marketingového oddelenia a analýza trhu / Ivan Bureš . Bratislava :  GENEZIS , 1991 . 16 s . ISBN 80-85220-19-9 . [3, of that borrowed 0]

The flux of ozone to a maize crop and the underlying soil during a growing season : DIZ / W.A.J. van Pul . Wageningen :  Landbouwuniversiteit , 1992 . 147 s . [1, of that borrowed 0]