Kalaj, David, Marijan Markovic, and Miodrag Mateljevic. 2013. “Carathéodory and Smirnov Type Theorems for Harmonic Mappings of the Unit Disk onto Surfaces”. Annales Fennici Mathematici 38 (2):565-80. https://doi.org/10.5186/aasfm.2013.3822.