1.http://all-about-lead-acid-batteries.capnfatz.com/all-about-lead-acid-batteries/lead-acid-battery-fundamentals/peukerts-law-and-exponent-explained/

2. Journal of Asian Electric Vehicles, Volume 8, Number 2, December 2010 

Apply a Piece-wise Peukert’s Equation with Temperature Correction Factor to NiMH Battery State of Charge Estimation
Guoliang Wu 1, Rengui Lu 2, Chunbo Zhu 3, and C. C. Chan 4

3.Battery University, website, “Calculating the battery runtime" , http://batteryuniversity.com/learn/article/calculating_the_battery_runtime

4. Daesik Kim, Hanju Cha, "Kt-Factor analysis of Lead acid battery for Nuclear power plant", Journal for International Conference on the Electrical Machines and Systems, Vol 2, No 4, pp 460-465, 2013.