1. L. Lyndon, Storage Battery Engineering: a Practical Treatise for Engineers, 3rd edn., McGraw-Hill, New York, London, 1911, p. 181.
2. Lead alloys: past, present and future
3. K. Peters, in: C.D.S. Tuck (Ed.), Modern Battery Technology, Ellis Horwood, New York, 1991, pp. 194–244.
4. H.W. Morse, Storage Batteries: the Chemistry and Physics of the Lead Accumulator, MacMillan, New York, 1912, p. 241.
5. G.W. Vinal, Storage Batteries, 4th edn., Wiley, New York, 1955, p. 7.