Sugiyama T. et al. 2005
Sugiyama T., Cam E.L., Verdel A., Moazed D., and Grewal S.I. 2005. RNA-dependent RNA polymerase is an essential component of a self- enforcing loop coupling heterochromatin assembly to siRNA production. Proc. Natl. Acad. Sci. 102: 152-157.