@article{TM2_2012_XV_2_a4,
     author = {Radoslav M. Dimitri\'c},
     title = {On {Angles} and {Angle} {Measurements}},
     journal = {The Teaching of Mathematics},
     pages = {133 },
     publisher = {mathdoc},
     volume = {XV},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2012_XV_2_a4/}
}