How much of it did you check out? It's real long. I started skimming though it but didn't get very far.
"This dissertation examines Vivaldi’s use of the viola as a flexible orchestra
resource, revealing the composer’s varied strategies for achieving striking contrasts of
texture and sonority in his work....."
I honestly thought that every composer used the viola, as well as the other instruments, to achieve this.
Interesting find Barry.