Subotic, M., N. Pjevalica, and L. Palfi. “Design and Modelling of an Enclosed Array of Square Spiral Antennas for Microwave Tomography”. Elektronika Ir Elektrotechnika, vol. 23, no. 2, Apr. 2017, pp. 47-53, doi:10.5755/j01.eie.23.2.17999.