historical
research
Müller, Irmgard (1937):Madame Royale. Prinzessin ohne Jugend.
Kesselringsche Hofbuchhandlung - Frankfurt am Main, Leipzig
Content:
The author published the first full biography of the Madame Royale in
German language. She translated the French letters from Madame Royale
to Renète de Chanterenne, the diary of Madame Royale, letters between her and Louis XVIII (1795-1799) and a lot of other important material. In spite of her publication of 1933 
Müller
1933, in which she believed in a substitution by Ernestine Lambriquet,
in the publication of 1937 she does not believe in a substitution and gives a lot
of arguments for that assumption.