In the page of Bow and Fingerings you can find three videos by italian soloist Franco Petracchi in which it's possible to listen to his music and look at his technique, with a lot of suggestments. The video had been taken from a TV program.
It's only in italian but it's always important for his great content.
"We all must thank you, Dear Vito, for your tireless work for all of us bassists!" You are doing so much for your colleagues and your art.
PIERMARIO MURELLI - "Nuova didattica per contrabbasso " Ed. RICORDI