Geodesic
Rigidity for surfaces of non-positive curvature.
Commentarii mathematici Helvetici, Tome 65 (1990) no. 3, pp. 150-170.

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Mots-clés : boundary rigid, geodesic conjugacy, nonpositive Gaussian curvature 
@article{CMH_1990__65_3_140188,
     author = {Christopher B. Croke},
     title = {Rigidity for surfaces of non-positive curvature.},
     journal = {Commentarii mathematici Helvetici},
     pages = {150--170},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1990},
     zbl = {0704.53035},
     url = {http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140188/}
}
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Christopher B. Croke. Rigidity for surfaces of non-positive curvature.. Commentarii mathematici Helvetici, Tome 65 (1990) no. 3, pp. 150-170. http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140188/