basketball over backboard

[bbbmws]

Can anyone please email me a link to the page where it defines the differences in what is out-of-bounds when a ball goes over a rectangular backboard as opposed to a round backboard?

Or e-mail me a scanned copy of the page in the rule book that explains this?

I had a rule book but cannot locate it, and I thought I found it on the web before, but can't now.

Thank you