An upcoming Naxos release - the 2 violin sonatas & Elegy of Georgy Catoire. MDT and Amazon (USA) both announce July 8 as availability date.
Gregory
http://www.mdt.co.uk/catoire-georgy-lvovich-complete-works-laurence-kayaleh-stephane-lemelin-naxos.html (http://www.mdt.co.uk/catoire-georgy-lvovich-complete-works-laurence-kayaleh-stephane-lemelin-naxos.html)
https://www.amazon.com/Georgy-Lvovich-Catoire-Complete-Violin/dp/B01FXRZCBG/ref=sr_1_315?s=music&ie=UTF8&qid=1466802741&sr=1-315[ (https://www.amazon.com/Georgy-Lvovich-Catoire-Complete-Violin/dp/B01FXRZCBG/ref=sr_1_315?s=music&ie=UTF8&qid=1466802741&sr=1-315%5B)
(https://dl.dropboxusercontent.com/u/8220758/Unsung%20Composer%20pix%20-%20leave%20in%20place/A1tUdAk8IjL._SL1500_.jpg)
There's not much competition in the sonatas but what there is is significant, including a recording by Oistrakh (live, I think) available on Brilliant Classics.