Õun, Kandela, and Gerda Mihhailova. “An Improved Approach to the Construct of Virtual Work Based On Estonian Service Sector Organisations”. Lithuanian Journal of Statistics 50, no. 1 (December 20, 2011): 14–22. Accessed May 3, 2024. https://www.journals.vu.lt/statisticsjournal/article/view/13914.