 Grichka Bogdanoff's thesis was "Fluctuations quantiques de la signature de la métrique à l'échelle de Planck" (1999) and Igor Bogdanoff's "État topologique de l'espace-temps à l'échelle zéro" (2002).In 2002, a bigger controversy arose around the Bogdanoff brothers' work.It came to be known as the Bogdanov affair, arising from an academic dispute regarding the legitimacy of a series of theoretical physics papers written by the brothers.