1. Kneisel P (2006) Nucl Instrum Methods A557:250
2. Lilje L (2001) PhD Thesis, University of Hamburg, Hamburg, Germany
3. Tian H (2008) PhD Thesis, The College of William & Mary, Williamsburg, Virginia, USA
4. Ciovati G (2006) Physica C 441:44
5. Saito K (2007) In: Proceedings of the 13th workshop on RF superconductivity, Beijing, China, TU202