• Fermentation reactor coupled with capillary electrophoresis for on-line bioprocess monitoringTahkoniemi, Heli Anneli; Helmja, Kati; Menert, Anne; Kaljurand, MihkelJournal of pharmaceutical and biomedical analysis2006 / 5, p. 1585-1591 : ill
• Study of VFAs formation during anaerobic digestion of thermally treated sludge by respirometric Oxitop methodMenert, Anne; Michelis, Merje; Helmja, Kati; Tahkoniemi, Heli Anneli; Vaalu, Tarmo; Malsub, Tõnu; Vilu, Raivo; Kaljurand, MihkelProceedings of 5th Conference on the Establishment of Cooperation between Companies and Institutions in the Baltic Sea Region2005 / p. 563