Krstic, D. S., P. B. Nikolic, M. C. Stefanovic, and F. Destovic. “The Joint Probability Density Function of the SSC Combiner Output Signal at Two Time Instants in the Presence of Log-Normal Fading”. Elektronika Ir Elektrotechnika, vol. 109, no. 3, Mar. 2011, pp. 11-16, doi:10.5755/j01.eee.109.3.161.