Letters from Mardefeld, dated 12 and 19 December 1741, quoted by Simievski: “Elisabeth Petrovna”, in Parole russe, 1859, cited by K. Waliszewski in La Derniere des Romanov, Elisabeth Ir e.
5. Letter dated 16 December 1741; cf. Daria Olivier, op. cit.
6. Cf. Daria Olivier, op. cit.