V. Seglins, Ag. Kukela, B. Lazdina. "STONE PILES AND SIGNS ON STONE SURFACES IN NORTHERN ESTONIA." 7th SWS International Scientific Conference on Arts And Humanities - ISCAH 2020, 2020, pp. 31-36. https://doi.org/10.5593/sws.iscah.2020.7.1/s19.04