@article{MEM_2012_41_1_a3,
     author = {{\CYRE}{\cyrs}{\cyrk}{\cyre}{\cyrn}{\cyra}{\cyrz}{\cyri}, {\CYRA}{\cyrv}{\cyrr}{\cyra}{\cyrm}},
     title = {{\CYRS}{\cyro}{\cyrf}{\cyrt}{\cyru}{\cyre}{\cyrr} {\cyrz}{\cyra} {\cyrb}{\cyri}{\cyrz}{\cyrn}{\cyre}{\cyrs}{\cyra} {\cyri}{\cyrl}{\cyri} {\cyrb}{\cyri}{\cyrz}{\cyrn}{\cyre}{\cyrs} {\cyrs}{\cyrhrdsn}{\cyrs} {\cyrs}{\cyro}{\cyrf}{\cyrt}{\cyru}{\cyre}{\cyrr}{\cyra}},
     journal = {Mathematics and Education in Mathematics},
     pages = {83--92},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {2012},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a3/}
}