He has got 22 years of rich research and teaching experience.

Construction started in September 2000 following eight years of research.

It's taken years of research and development to win the order.

After two years of research and development the company began commercial operations in 1991.

The book was published after six years of writing and research by the author.

This decision was reached following 13 years of analysis, research and debate.

After many years of research, he turned out to be right.

He published the work in 1545, after some four years of research.

You certainly wouldn't think it would start me off on all those long years of private search and research.

The boat has been designed, after more than a year of research.