Published online today in the Journal of Geophysical Research-Planets:

Basilevsky, Alexander T.; Head, James W.
Impact craters on regional plains on Venus: Age relations with wrinkle ridges and implications for the geological evolution of Venus
J. Geophys. Res., Vol. 111, No. E3, E03006
10.1029/2005JE002473
28 March 2006
Abstract
Reprint (7.1 Mb PDF)

The collaboration between Brown University and the Vernadsky Institute has been a very rewarding venture. A good example of how science reached across the divide of the cold war. You know there was actually a diplomatic treaty between the Soviet Union and the State of Rhode Island, to enable their joint work. The Federal Government refused to do it.

The Russians invited Head and others to be co-investigators on the Venera-15/16 missions, and the American did the same for them during Magellan.

The wrinkle ridges, as describe in this study, may prove to be a useful tool in the discrimination of the craters/caldara of Titan.