EBSEES: 8 hits for Čaadaev, Petr Ja.

The European Bibliography of Slavic and East European Studies (EBSEES) collects books, journal articles, reviews and dissertations from Eastern Europe (former countries of Eastern Bloc) which were published in Belgium, Germany, Finland, France, Great Britain, the Netherlands, Austria and Switzerland from 1991 to 2007. The segment "Literature" and "Culture" of the European Bibliography of Slavic and East European Studies contains 18.000 bibliographic entries (from the total asset of 85.000). More information can be found here.

Your search for Čaadaev, Petr Ja. provides 8 hits
1	Tchaadaev: un ami de jeunesse, ou les origines d'une réputation Liamina, Catherine, in: Romantisme. Revue du Dix-neuvième Siècle, 92, 1996, p. 79-85
2	Puškin et l'histoire de la Russie. La lettre à P. Čaadaev Le Guével, Michel, in: Slovo, 22-23, 1999, p. 213-22
3	Poėt i filosof o sud'bah Rossii. (Puškin i Čaadaev) Lepahin, Valerij; Zavarzin, Andrej, in: Vestnik russkogo hristianskogo Dviženija, 176(2-3), 1997, p. 167-96
4	Dva pis'ma Mihaila Žihareva in: Simvol, 30, déc., 1993, p. 339-41
5	Philosophical works of Peter Chaadaev [Čaadaev] Chaadaev, Peter, Dordrecht, London, Kluwer Academic, 1991, 318 p.
6	Apologie eines Wahnsinnigen [Čaadaev] Tschaadajew, Peter, Leipzig, Reclam, 1992, 248 p.
7	Les conversions au catholicisme en Russie au XIXe siècle: ruptures historiques et culturelles Dmitrieva, Katja, in: Revue des Études slaves, 67(2-3), 1995, p. 311-36
8	The golden age of Russian literature and thought: selected papers from the Fourth World Congress for Soviet and East European Studies, Harrogate, 1990 Basingstoke, Macmillan, 1992, xiv+174 p

The European Bibliography of Slavic and East European Studies (EBSEES) - 1991-2007