* Leonid A. Gavrilov & Natalia S. Gavrilova ( 1991 ), The Biology of Life Span: A Quantitative Approach.
* Leonid A. Gavrilov & Natalia S. Gavrilova ( 1991 ), The Biology of Life Span: A Quantitative Approach.
* Leonid A. Gavrilov & Natalia S. Gavrilova ( 1991 ) The Biology of Life Span: A Quantitative Approach.
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