Neda Chehlarova, Koya Chehlarova
Report: “On 360 degrees”
In: national education seminar “The Research Approach in Mathematical Education” 27 – 28 november 2020
http://www.math.bas.bg/omi/nso/?cat=21
http://www.math.bas.bg/omi/nso/docs/2020/NSO_2020_programa.pdf
