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. 2017 Jan 21;413:58–65. doi: 10.1016/j.jtbi.2016.11.010
k relation
0,a1
ϕ
a
πa=21ppπoa1k=1πk
a+1,is
πk=21ppπka1+2ppπka
is+1
πis+1=2qπisa+(1+q)πis+1a
is+2,is+a
πk=2qπka1+(1+q)πka+qπk1
is+a+1
πis+a+1=2qπis+πis+1+qπis+a
>is+a+1
πk=qπka1+πka+qπk1