Markevicius, V., M. Cepenas, D. Navikas, A. Valinevicius, D. Andriukaitis, and T. Surgailis. “The Means for Evaluation of Light Source Characteristics”. Elektronika Ir Elektrotechnika, vol. 19, no. 1, Jan. 2013, pp. 48-51, doi:10.5755/j01.eee.19.1.3253.