@article{MEM_2010_39_1_a36,
     author = {{\CYRG}{\cyrr}{\cyro}{\cyrz}{\cyrd}{\cyre}{\cyrv}, {\CYRS}{\cyra}{\cyrv}{\cyra} and {\CYRN}{\cyre}{\cyrn}{\cyrk}{\cyro}{\cyrv}, {\CYRV}{\cyre}{\cyrs}{\cyre}{\cyrl}{\cyri}{\cyrn}},
     title = {{\CYRV}{\cyrhrdsn}{\cyrr}{\cyrh}{\cyru} {\cyre}{\cyrd}{\cyri}{\cyrn} {\cyrk}{\cyrl}{\cyra}{\cyrs} {\cyrk}{\cyrr}{\cyri}{\cyrv}{\cyri} {\cyro}{\cyrt} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyra} {\cyrs}{\cyrt}{\cyre}{\cyrp}{\cyre}{\cyrn}},
     journal = {Mathematics and Education in Mathematics},
     pages = {306--312},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a36/}
}