Geodesic
Differential Sandwich Theorems for some Subclasses of Analytic Functions Involving a Linear Operator
Acta mathematica Universitatis Comenianae, Tome 76 (2007) no. 2 
T. N. Shammugam; C. Ramachandran; M. Darus; S. Sivasubramanian. Differential  Sandwich Theorems for some Subclasses of Analytic Functions Involving a Linear Operator. Acta mathematica Universitatis Comenianae, Tome 76 (2007) no. 2. http://geodesic.mathdoc.fr/item/AMUC_2007_76_2_a18/
@article{AMUC_2007_76_2_a18,
     author = {T. N. Shammugam and C. Ramachandran and M. Darus and S. Sivasubramanian},
     title = {Differential  {Sandwich} {Theorems} for some {Subclasses} of {Analytic} {Functions} {Involving} a {Linear} {Operator}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2007},
     volume = {76},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2007_76_2_a18/}
}
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By making use of the familiar Carlson-Shaffer operator,the authors derive derive some subordination and superordination results for certain normalized analytic functions in the open unit disk. Relevant connections of the results, which are presented in this paper, with various other known results are also pointed out.