And what's Rudnitsky A.? Painting curious, and the price is small. Whether doubt what the age, then it is not clear who the Rudnitskii? And nothing about the signature is written.
But work S. Sarsuns "profile" is the conclusion of a recognized expert on his work, it's strange why this is not observed.
About Nadia Leger rather funny biography. Here is more scientific, though in Belarusian:
http://be-x-old.wikipedia.org/wiki/Н...іч-Лежэ