This directory contains a PDF version of: Felsenstein, J. 2005. Using the quantitative genetic threshold model for inferences between and within species. Philosophical Transactions of the Royal Society of London, series B 360: 1427-1434. as file threshold.pdf It is a preprint version which differs slightly from the printed version.
Please note carefully that these papers, as published in the journals, are copyright to the publishers of those journals.