I don't know how TopoR implements this, but the linked Wikipedia article contains a reference to a PhD thesis on this topic: > https://web.archive.org/web/2017

I don't know how TopoR implements this, but the linked Wikipedia article contains a reference to a PhD thesis on this topic: > https://web.archive.org/web/20170718184145/https://pdfs.semanticscholar.org/91ce/7726d0b103db47ab5db433ed75b538e6e7f8.pdf https://web.archive.org/web/20170718184145/https://pdfs.sema...