@article{10_4064_cm_45_2_251_256,
     author = {Wolfgang K\"uhnel},
     title = {0-tight surfaces with boundary and the total curvature of curves in surfaces},
     journal = {Colloquium Mathematicum},
     pages = {251--256},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1981},
     doi = {10.4064/cm-45-2-251-256},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-45-2-251-256/}
}