@article{MEM_2010_39_1_a43,
     author = {{\CYRK}{\cyrr}{\cyru}{\cyrsh}{\cyrk}{\cyro}{\cyrv}, {\CYRH}{\cyrr}{\cyri}{\cyrs}{\cyrt}{\cyro} and {\CYRK}{\cyrr}{\cyru}{\cyrsh}{\cyrk}{\cyro}{\cyrv}{\cyra}, {\CYRM}{\cyra}{\cyrr}{\cyri}{\cyra}{\cyrn}{\cyra} and {\CYRA}{\cyrt}{\cyra}{\cyrn}{\cyra}{\cyrs}{\cyro}{\cyrv}, {\CYRV}{\cyri}{\cyrk}{\cyrt}{\cyro}{\cyrr} and {\CYRK}{\cyrr}{\cyru}{\cyrsh}{\cyrk}{\cyro}{\cyrv}{\cyra}, {\CYRM}{\cyra}{\cyrr}{\cyrg}{\cyra}{\cyrr}{\cyri}{\cyrt}{\cyra}},
     title = {{\CYRK}{\cyro}{\cyrm}{\cyrp}{\cyryu}{\cyrt}{\cyrhrdsn}{\cyrr}{\cyrn}{\cyra} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyra} {\cyrz}{\cyra} {\cyro}{\cyrb}{\cyru}{\cyrch}{\cyre}{\cyrn}{\cyri}{\cyre} {\cyrp}{\cyro} {\cyrp}{\cyrr}{\cyro}{\cyrg}{\cyrr}{\cyra}{\cyrm}{\cyri}{\cyrr}{\cyra}{\cyrn}{\cyre}},
     journal = {Mathematics and Education in Mathematics},
     pages = {354--358},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a43/}
}