... model2.1
based on author's work Ref. [Garcia-Sanchez 05] 
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... dynamics2.2
based on author's work Ref. [Usatenko 06] 
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... approximation2.3
based on author's work Ref. [Usatenko 06] 
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... calculations2.4
based on author's work Ref. [Paz 07] 
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... method2.5
based on author's work 
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... method2.6
based on author's work Ref. [Chubykalo-Fesenko 04] 
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