I really wish I could give you more info about this duo. Unfortunately I don't have the music for it anymore and neither does my duo partner. Also, strangely, I can not find it on imslp (there are 6 duos, but this one is not in there). If and when I manage to get a hold of it you will be the first ones to know.
@@lucasvasconcellos3040 that's great. Glad you found it. I see it's for violin and viola.. strange.. I read from a cello part for sure. So maybe there was some other transcription or something.