Agreed with mr. Rowuk...Vizzutti is a great inspiration. His clinic videos on youtube are a great starting point. The rare Mendez videos on youtube are also wonderful.
What I enjoy most about the Mendez videos is his encouragement to play a little bit...then play a little bit more until the most of a single breath is utilized.
The Vizzutti clinic videos show that it's important to practice articulations by listening...Have you ever noticed playing a triple tongue exercise sometimes sounds like real triples...and other times sounds like muddy slop? I like how the Vizzuti clinic video encourages players to truly listen to what is coming out of the horn.