The most fruitful studies have been based on calculated energy levels.

The 1960s and 1970s were for the composer the most fruitful period.

And it was there he embarked on the most fruitful period of his career.

Meanwhile, it is such debates that are the most fruitful.

Reading is the most fruitful source, but it all helps.

I think that would be the most fruitful place to start.

Our work together seemed the most fruitful topic of conversation.

You know that the best, most fruitful part of your life is over.

Since then, they have confined their work to the five most fruitful sites.

This was perhaps the most fruitful year of his short career.