@article{AFM_1987_12_2_a12,
     author = {Stephen Agard and Richard Fehlmann},
     title = {On the extremality and unique extremality of affine mappings in space, an addendum},
     journal = {Annales Fennici Mathematici},
     pages = {299--301},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1987},
     doi = {10.5186/aasfm.1987.1201},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1987.1201/}
}