@article{AFM_1986_11_1_a5,
     author = {Stephen Agard and Richard Fehlmann},
     title = {On the extremality and unique extremality of affine mappings in space},
     journal = {Annales Fennici Mathematici},
     pages = {87--110},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1986},
     doi = {10.5186/aasfm.1986.1101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1986.1101/}
}