The meaning of reference as a noun is the action of mentoring or alluding to something. The term is also a verb that means to provide citations of authorities for an article or book.
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When calling a function, passing a variable's address as function parameter.
From point E to point D also??
double point perspective is probably two point perspective which is just instead of using one point like in one point perspective, there are two points that come from the eyeline/horizon line. Here is a simple link on what and how to draw two point perspective. http://drawsketch.about.com/library/weekly/aa021603c.htm
pressure point
6 degrees