1. Microdetermination of the pyrophosphate complex of tervalent manganese by titration with a ferrous salt;Barek;Mikrochim. Acta,1974
2. The determination of the titre of ascorbic acid solutions;Barek;Anal. Lett,1975
3. Barek, J., and Berka, A., Oxidation of benzidine, o,o′-tolidine and o,o′-dianisidine by the pyrophosphate complex of manganese (III) and by manganese (III) sulphate. Coll. Aechoslov. Chem. Commun., in press.
4. Newer redox titrants;Berka,1965
5. A study of oxidation of benzidine, o,o′-tolidine and o,o′-dianisidine;Dohnal;Microchem. J,1974