@article{MEM_2010_39_1_a38,
     author = {{\CYRD}{\cyru}{\cyrr}{\cyre}{\cyrv}{\cyra}-{\CYRT}{\cyru}{\cyrp}{\cyra}{\cyrr}{\cyro}{\cyrv}{\cyra}, {\CYRD}{\cyra}{\cyrn}{\cyri}{\cyre}{\cyrl}{\cyra}},
     title = {{\CYRR}{\cyre}{\cyra}{\cyrl}{\cyri}{\cyrz}{\cyra}{\cyrc}{\cyri}{\cyrya} {\cyrn}{\cyra} {\cyre}{\cyrl}{\cyre}{\cyrk}{\cyrt}{\cyrr}{\cyro}{\cyrn}{\cyrn}{\cyro}-{\cyrb}{\cyra}{\cyrz}{\cyri}{\cyrr}{\cyra}{\cyrn}{\cyri} {\cyrk}{\cyru}{\cyrr}{\cyrs}{\cyro}{\cyrv}{\cyre} {\cyrv} {\cyrm}{\cyra}{\cyrg}{\cyri}{\cyrs}{\cyrt}{\cyrhrdsn}{\cyrr}{\cyrs}{\cyrk}{\cyra} {\cyrp}{\cyrr}{\cyro}{\cyrg}{\cyrr}{\cyra}{\cyrm}{\cyra} {\cyrz}{\cyra} {\cyrp}{\cyre}{\cyrd}{\cyra}{\cyrg}{\cyro}{\cyrz}{\cyri}},
     journal = {Mathematics and Education in Mathematics},
     pages = {318--324},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a38/}
}