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Fellermann, Klaus, Ingolf Schiefke, István Rácz, Jelena Derova, Laimas Jonaitis, Sarah Wehrum, Tanju Nacak, ja Roland Greinwald. "Efficacy and Safety of Prolonged Release Budesonide Granules in Mesalazine-refractory Ulcerative Colitis: A Multi-centre Phase IIa Study (TOPICAL-1)." United European Gastroenterol J 2020.

Fellermann, Klaus, et al. "Efficacy and Safety of Prolonged Release Budesonide Granules in Mesalazine-refractory Ulcerative Colitis: A Multi-centre Phase IIa Study (TOPICAL-1)." United European Gastroenterol J 2020.