@article{MEM_2010_39_1_a32,
     author = {{\CYRV}{\cyrhrdsn}{\cyrl}{\cyrch}{\cyre}{\cyrv}{\cyra}, {\CYRS}{\cyrt}{\cyro}{\cyrya}{\cyrn}{\cyrk}{\cyra} and {\CYRT}{\cyro}{\cyrd}{\cyro}{\cyrr}{\cyro}{\cyrv}, {\CYRV}{\cyrl}{\cyra}{\cyrd}{\cyri}{\cyrm}{\cyri}{\cyrr}},
     title = {{\CYRZ}{\cyra} {\cyri}{\cyrz}{\cyrv}{\cyrhrdsn}{\cyrn}{\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyrn}{\cyri}{\cyrt}{\cyre} {\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyri} {\cyrn}{\cyra} {\cyro}{\cyrb}{\cyru}{\cyrch}{\cyre}{\cyrn}{\cyri}{\cyre} {\cyrp}{\cyro} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrk}{\cyra}},
     journal = {Mathematics and Education in Mathematics},
     pages = {281--286},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2010},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a32/}
}