The scores of Michel Sogny are available on this link:
https://www.laflutedepan.com/recherche?Effiltre=1&Effiltre2=0&tri=0&page=0001&boutique=&instrument=&style=&motcle=michel
Here is a treat a young Khatia Buniatishvili in 1999 when she was Michel Sogny's pupil. This was filmed at a Masterclass at the Villa Schindler Austria, works include Liszt, Chopin