@article{10_4064_ap_25_3_227_239,
     author = {L. Dubikajtis and M. Kuczma},
     title = {On non-localized oriented angles},
     journal = {Annales Polonici Mathematici},
     pages = {227--239},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1971},
     doi = {10.4064/ap-25-3-227-239},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-25-3-227-239/}
}