@article{AFM_1979_4_2_a15,
     author = {O. Martio and J. Sarvas},
     title = {Injectivity theorems in plane and space},
     journal = {Annales Fennici Mathematici},
     pages = {383--401},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1979},
     doi = {10.5186/aasfm.1978-79.0413},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1978-79.0413/}
}