1. Collins, J.H., Owens, J.M., Smith, C.V., Adam, J.D., and Bardai, Z.M.: Microwave devices based on magnetostatic wave reflecting arrays, 1977), p. 332–335 IEEE MTT-S (IEEE catalogue 77 CH 1219-SMTT)
2. Ramo, S., Whinnery, J.R., and Van Duzer, T.: ‘Fields and waves in communication electronics’, (John Wiley 1965), p. 379 eqn. 8