Cassinese, A.., A.. Andreone, M.. Barra, C.. Granata, P.. Orgiani, F.. Palomba, G.. Panariello, G.. Pica, and F.. Schettino,
"Dual mode superconducting planar filters based on slotted square resonators",
IEEE Transactions on Applied Superconductivity, vol. 11, no. 1 I, pp. 473-476, 2001.