@misc{Ma_William_Two-point,
 author={Ma, William and Maitani, Fumio and Minda, David},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 title={Two-point Comparisons Between Hyperbolic and Euclidean Geometry on Plane Regions},
 type={artykuł},
 keywords={matematyka},
}