@article{alhargan:1992:fr,
    author = {Alhargan, F. and Judah, S.},
     title = {Frequency response characteristics of the multiport
              planar elliptic patch},
   journal = {IEEE Trans. Microwave Theory Tech.},
    volume = {40},
      year = {1992},
    number = {8},
     pages = {1726–1730},
       doi = {10.1109/22.149519}}