[Openflipper] Boolean support in OpenFlipper?

Hi!

Reading the paper "Simple and Robust Boolean Operations for Triangulated Surfaces", by Mei and Tipper (available here: https://arxiv.org/pdf/1308.4434.pdf ), it mentions that "Besides the well-known libraries CGAL [23], several open source packages (MeshLab [5], OpenFlipper [15], MEPP [13]) also contain robust implementations of Boolean operations".

However, I've been browsing the OpenFlipper source code, and I don't see any traces of boolean or CSG algorithms.

I'm looking for a robust implementation of boolean operations in meshes with a license similar to OpenFlipper (i.e.: non-copyleft), so if there's such an implementation, please tell me.

Thanks!

ardi