The Cello Sonata op. 28 never found a creator.
Eugène Ysaÿe, not knowing the cello, based on his viola to write it in 1927.
It was only 50 years later that Aaron van de Moortel, viola teacher at the Brussels Conservatory, transcribed it for this instrument. He performed it in public, but in very private circles.
This work has never known a diffusion, contrary to the sonatas for solo violin, played and recorded hundreds of times by the greatest interpreters.