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Trujillo, Javier Garcia-Gasco; de Toca, Alvaro Noval Sanchez; Ortego, Ignacio Montesinos; Gonzalez, Jose Manuel Fernandez; Perez, Manuel Sierra . (2013). Design and Implementation of a Quasi-Orthogonal Switching Beam-Former for Triangular Arrays of Three Radiating Elements. IEEE Transactions on Antennas and Propagation, 61(10), 5028–5035. doi:10.1109/TAP.2013.2272674 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research