@article{MEM_2010_39_1_a35,
     author = {{\CYRG}{\cyro}{\cyrr}{\cyra}{\cyrn}{\cyro}{\cyrv}{\cyra}, {\CYRI}{\cyrr}{\cyri}{\cyrn}{\cyra}},
     title = {{\CYRR}{\cyro}{\cyrl}{\cyre}{\cyrv}{\cyra}{\cyrt}{\cyra} {\cyri}{\cyrg}{\cyrr}{\cyra} {\cyrk}{\cyra}{\cyrt}{\cyro} {\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyra} {\cyrn}{\cyra} {\cyrp}{\cyro}{\cyrv}{\cyri}{\cyrsh}{\cyra}{\cyrv}{\cyra}{\cyrn}{\cyre} {\cyrn}{\cyra} {\cyrt}{\cyrv}{\cyro}{\cyrr}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyra}{\cyrt}{\cyra} {\cyra}{\cyrk}{\cyrt}{\cyri}{\cyrv}{\cyrn}{\cyro}{\cyrs}{\cyrt} {\cyrn}{\cyra} {\cyru}{\cyrch}{\cyre}{\cyrn}{\cyri}{\cyrc}{\cyri}{\cyrt}{\cyre} {\cyrv} {\cyrch}{\cyra}{\cyrs}{\cyro}{\cyrv}{\cyre}{\cyrt}{\cyre} {\cyrp}{\cyro} {\cyri}{\cyrn}{\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrk}{\cyra}},
     journal = {Mathematics and Education in Mathematics},
     pages = {300--305},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a35/}
}