References

1. J. Sevick, Transmission Line Transformers, 2nd Edition,
   Noble Publishing, Atlanta GA
    
   
2. J. Sevick, Building and Using Baluns and Ununs, 1st Edition,
   CQ Communications Inc., Hicksville NY
    
   
3. G Guanella, "Novel Matching Systems for High Frequencies,"
   Brown-Boveri Review,
   Vol 31, September 1994, pages 327-329
    
   
4. CL Ruthroff, "Some Broad-Band Transformers," Proc IRE,
   Vol 47, August 1959, pages 1337-1342
    
   
5. E Rotholz, "Transmission Line Transformers,"
   IEEE Transactions on Microwave Theory and Techniques,
   Vol MTT-29, No4, April 1981, pages 327-331