Kiseliovas, Arkadijus, and Danutė Kiseliova. “Elementary Mathematics Reseach Done by Primary School Pupils”. Lietuvos matematikos rinkinys 39, no. III (December 17, 1999): 287–290. Accessed November 6, 2025. https://www.zurnalai.vu.lt/LMR/article/view/35592.