Massless scalar field in a two-dimensional de Sitter universe. In: Rigorous quantum field theory. Vol. 251. Rigorous quantum field theory. Basel: Birkhäuser; 2007. pp. 27–38.
. Decomposing quantum fields on branes. Nuclear Phys. B. 2000 ;581:575–603.
. A general construction of conformal field theories from scalar anti-de Sitter quantum field theories. Nuclear Phys. B. 2000 ;587:619–644.
. Correspondence between Minkowski and de Sitter quantum field theory. Phys. Lett. B. 1999 ;462:249–253.
. Generation of primordial fluctuations in curved spaces. Gravit. Cosmol. 1998 ;4:121–127.
.