@article{10_4064_sm188_1_3,
     author = {Ha{\"\i}kel Skhiri},
     title = {On the  perturbation functions and similarity orbits},
     journal = {Studia Mathematica},
     pages = {57--66},
     year = {2008},
     volume = {188},
     number = {1},
     doi = {10.4064/sm188-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm188-1-3/}
}