@article{alhargan:1995:an,
    author = {Alhargan, F. and Judah, S.},
     title = {A general mode theory for the elliptic disk
              microstrip antenna},
   journal = {IEEE Trans. Antennas and Propagation},
    volume = {43},
      year = {1995},
    number = {6},
     pages = {560–568},
       doi = {10.1109/8.387171}}