That article adds little to nothing to the author's original explanation. I'd suggest you read this page instead: http://info.ee.surrey.ac.uk/Personal/Z.Kalal/

That article adds little to nothing to the author's original explanation. I'd suggest you read this page instead: http://info.ee.surrey.ac.uk/Personal/Z.Kalal/tld.html http://info.ee.surrey.ac.uk/Personal/Z.Kalal/tld.html That page also has links to the papers referenced by SandB0x.