Futa, Anna, and Dariusz Partyka. 2019. “The Schwarz Type Inequality for Harmonic Functions of the Unit Disc Satisfying Sectorial Condition”. Bulletin de la Société Des Sciences et Des Lettres de Łódź 68 (2): 95-108. https://doi.org/10.26485/0459-6854/2018/68.2/10.