M. Kocifaj, S. Darula, R. Kittler: HOLIGILM: Hollow light guide interior illumination method –
An analytic calculation approach for cylindrical light-tubes. Solar Energy 82 (2008) 247–259. (An analytical solution of light propagation in guides - on this solution is based HOLIGILM software.)
S. Darula, F. Kundracik, M. Kocifaj, R. Kittler: Tubular light guides: estimation of indoor illuminance levels. LEUKOS 6 (2010) 241–252. (The capabilities of HOLIGILM-software for illumination estimations.)
M. Kocifaj, F. Kundracik, S. Darula, R. Kittler: Theoretical solution for light transmission of a bended hollow light guide. Solar Energy 84 (2010) 1422–1432. (A semianalytical solution for the light propagation in bended guides - will be implemented in future versions of HOLIGILM software.)