@InProceedings{KZ21,
    title = "{Upward Planar Drawings with Three and More Slopes}",
    author = "Klawitter, Jonathan
          and Zink, Johannes",
    editor = "Purchase, Helen C.
          and Rutter, Ignaz"
    booktitle = "{Graph Drawing and Network Visualization}",
    year = "2021",
    publisher = "Springer International Publishing",
    pages = "149--165",
    isbn = "978-3-030-92931-2",
	doi = "10.1007/978-3-030-92931-2_11",
	url = "https://doi.org/10.1007/978-3-030-92931-2_11"
}