@article{10_4064_fm221_1_4,
     author = {Rich\'ard Balka},
     title = {Metric spaces admitting only trivial weak contractions},
     journal = {Fundamenta Mathematicae},
     pages = {83--94},
     publisher = {mathdoc},
     volume = {221},
     number = {1},
     year = {2013},
     doi = {10.4064/fm221-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm221-1-4/}
}