@article{10_1023_A_1026098228348,
     author = {\v{S}ev\v{c}{\'\i}k, Jan},
     title = {Weak nonlinearity in a model which arises from the {Helmert} transformation},
     journal = {Applications of Mathematics},
     pages = {161--174},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {2003},
     doi = {10.1023/A:1026098228348},
     mrnumber = {1903048},
     zbl = {1099.62065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1023/A:1026098228348/}
}