• The realization of the precision system for phase and harmonics measurementEek, Andres; Kolk, ArnoAutomation, simulation & measurement. Section A, Automation. Section M, Measurement : 3rd biennal conference : Tallinn, Estonia, October 7-11, 1991 = Automatiseerimine, modelleerimine ja mõõtmine : 3. rahvusvaheline konverents / Tallinna Tehnikaülikool1992 / p. 95-99: ill https://www.ester.ee/record=b1064034*est