@article{CNC-skopenkov-2020,
title={Characterizing envelopes of moving rotational cones and applications
       in {CNC} machining},
author={Mikhail Skopenkov and Pengbo Bo and Michael Bartoň and Helmut
        Pottmann},
year={2020},
journal = {Comp. Aided Geometric Design},
volume = 83,
}