Geodesic
A note on neighborhoods of certain classes of analytic functions with negative coefficients
Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 2 
S. Latha; D. S. Raju. A note on neighborhoods of certain classes of analytic functions
with negative coefficients. Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 2. http://geodesic.mathdoc.fr/item/AMUC_2008_77_2_a10/
@article{AMUC_2008_77_2_a10,
     author = {S. Latha and D. S. Raju},
     title = {A note on neighborhoods of certain classes of analytic functions
with negative coefficients},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2008},
     volume = {77},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2008_77_2_a10/}
}
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Voir la notice de l'article provenant de la source Comenius University

The purpose of the present paper is to make use of the familiar concept of neighborhoods of analytic functions. Several inclusion relations associated with the ( n , δ) neighborhoods of various subclasses defined by Sălăgean operator are proved. Special cases of these results are shown to yield known results in the literature.