@article{10_4064_fm176_1_4,
     author = {Francisco R. Ruiz del Portal and Jos\'e M. Salazar},
     title = {Shape index in metric spaces},
     journal = {Fundamenta Mathematicae},
     pages = {47--62},
     publisher = {mathdoc},
     volume = {176},
     number = {1},
     year = {2003},
     doi = {10.4064/fm176-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm176-1-4/}
}