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notation - How are double stops / divisi indicated in violin scores? - Music: Practice & Theory Stack Exchange
Beginner Violin Book: Double Stops for String Education
The Beginners Guide to Violin Double-stopping - 8notes.com
D.C. Dounis The Technique Of Double Stop - Selected Exercises From Op. 12 & 29 - Arranged For Viola By Demetrius Constantine Dounis - Digital Sheet Music For Individual Part - Download
Double Stop Beginnings for Violin, Book One - C. HARVEY PUBLICATIONS