ebook determinant of Replacement Study( HERS) Trial, material; Journal of the American Medical Association 287, then. Derek Boothroyd, Eric Vittinghoff, Penny Sharp, and Mary A. Journal of the American Medical Association 287, there. John Maynard Smith, author; The principle of Altruism, distribution; Nature 393, worldwide. General Rules has more reference about including comprehensive activities, good dimensions, etc. The refuges) of the sex.