@article{cnc-bo-2017,
title = {Automatic fitting of conical envelopes to free-form surfaces for
         flank {C}{N}{C} machining},
author = {Pengbo Bo and Michael Barto\v{n} and Helmut Pottmann},
journal = {Computer Aided Design},
year = 2017,
volume = {91},
pages = "84-94",
}