@book{bnn-elfcat-21,
 author = {Bekos, Michael A. and Niedermann, Benjamin and Nöllenburg, Martin},
 doi = {10.2200/S01115ED1V01Y202107VIS014},
 publisher = {Morgan \& Claypool},
 series = {Synthesis Lectures on Visualization},
 title = {External Labeling: Fundamental Concepts and Algorithmic Techniques},
 year = {2021}
}