@article{MEM_2010_39_1_a33,
     author = {{\CYRG}{\cyre}{\cyro}{\cyrr}{\cyrg}{\cyri}{\cyre}{\cyrv}, {\CYRV}{\cyrl}{\cyra}{\cyrd}{\cyri}{\cyrm}{\cyri}{\cyrr} and {\CYRD}{\cyra}{\cyrr}{\cyra}{\cyrk}{\cyrch}{\cyri}{\cyre}{\cyrv}{\cyra}, {\CYRD}{\cyro}{\cyrn}{\cyrk}{\cyra} and {\CYRK}{\cyra}{\cyrp}{\cyrr}{\cyra}{\cyrl}{\cyro}{\cyrv}, {\CYRS}{\cyrt}{\cyro}{\cyrya}{\cyrn}},
     title = {{\CYRM}{\cyre}{\cyrzh}{\cyrd}{\cyru}{\cyrn}{\cyra}{\cyrr}{\cyro}{\cyrd}{\cyrn}{\cyro} {\cyro}{\cyrt}{\cyrb}{\cyro}{\cyrr}{\cyrn}{\cyro} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro} {\cyrs}{\cyrhrdsn}{\cyrs}{\cyrt}{\cyre}{\cyrz}{\cyra}{\cyrn}{\cyri}{\cyre} {{\textquotedblleft}{\CYRG}{\cyra}{\cyrl}{\cyri}{\cyrl}{\cyre}{\cyrishrt}{\textquotedblright}}},
     journal = {Mathematics and Education in Mathematics},
     pages = {287--291},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a33/}
}