Kreknin, V.A., and M.S. Lvov. 2007. “he sage of rogramming oftware “The ibrary of lectronic isual ids ‘Algebra -9’ uring lgebra earning in orms”. ournal of nformation echnologies in ducation (ITE), no. 1 (May):078-087. https://doi.org/10.14308/ite000011.