The analysis of the results of the repeated gravity measurements carried out on the profile of Põltsamaa-Lelle and groundwater as one of the disturbing factorsVilipuu, Marek; Oja, Tõnis; Sildvee, Heldur; Paesalu, JoelXII Geofysiikan päivat 2005, Helsingissä 19.-20.05.20052005 / p. 253-258 Use of simplified bowed string model in physics education : a laboratory experimentVilipuu, Marek; Kartofelev, Dmitri; Kalda, JaanProceedings of Meetings on Acoustics2022 / art. 025001 https://doi.org/10.1121/2.0001628 Conference Proceedings at Scopus Article at Scopus