@article{10_4064_ap_21_2_239_244,
     author = {M. Rochowski},
     title = {On the total curvature of a closed curve},
     journal = {Annales Polonici Mathematici},
     pages = {239--244},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1968},
     doi = {10.4064/ap-21-2-239-244},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-21-2-239-244/}
}