Please let me know if the following references/sites are useful to you:
1. rgsbio09 - 09 Lincoln Index
http://rgsbio09.wikispaces.com/09+Lincoln+Index
This estimate of population size is called the Lincoln Index. There are some assumptions behind this equation. What do you think are some of the assumptions?
The Lincoln index is used to estimate population size based on the capture-mark- release-recapture ... Lincoln Index: Estimated Population = (n1 × n2) ÷ n3.
3. A Method of Population Estimation: Mark & Recapture
http://www.radford.edu/~jkell/mark_rec103.pdfFor this reason, ecologists generally ...
The methods ecologists use vary in their level of precision and difficulty of ... to as the Lincoln Index or the Petersen Index.
4. Estimating population size using capture–recapture encounter