R. V. F. Idzelis, “The Interplay of Spontaneous (“Natural”) and Deliberate (‘Artificial’) in the Study of International English”, KLB, vol. 47, no. 3, pp. 22–38, Dec. 1998, Accessed: Aug. 29, 2026. Available: https://journals.vu.lt/kalbotyra/article/view/31389