Probabilistic Visibility Evaluation for Direct Illumination. - Niels Billen; Björn Engelen; Ares Lagae; Philip Dutré (Comput. Graph. Forum, 2013)

Probabilistic visibility evaluation using geometry proxies. - Niels Billen; Ares Lagae; Philip Dutré (Comput. Graph. Forum, 2014)

Efficient Visibility Heuristics for kd-trees Using the RTSAH. - Matthias Moulin; Niels Billen; Philip Dutré (EGSR (EI&I), 2015)

Line Sampling for Direct Illumination. - Niels Billen; Philip Dutré (Comput. Graph. Forum, 2016)

Temporal Coherence for Metropolis Light Transport. - Joran Van de Woestijne; Roald Frederickx; Niels Billen; Philip Dutré (EGSR (EI&I), 2017)

Reduction of stochastic noise in physically-based rendering algorithms ; Verminderen van stochastische ruis in fysisch-gebaseerde rendering algoritmen. - Niels Billen (2017)