Climate - Carbon Cycle Feedback Analysis: Results from the C4MIP Model Intercomparison. (realclimate.org)
Regarding the equation dT being proportional to 1 / 1 - f, you can find this in a number of papers (see Roe, 2009 for a more recent mathematical overview of feedback analysis). (realclimate.org)
The disappointing thing about Dessler's paper is that it neither addresses Spencer's criticisms nor his new feedback analysis method: it is simply something to be waved at anybody who cites Spencer's arguments. (climate-resistance.org)