1. Say, M.G.: ‘Electrical engineering design manual’, (Chapman and Hall Ltd. 1962),3rd
2. Scott, L.: ‘Induction regulator’, (549356)
3. ‘Provision of cooling fins on the stator of electro magnetic machines using lamination structures’, (9613513.2)
4. ‘‘General requirements for rotating electrical machines’, part 101, specification for rating and performance’, British Standard 4999, 1987