Solid fluorine received significant study in the 1920s and 30s, but relatively less until the 1960s.

There is only one significant study which disputes this.

A. I know of no significant study within the last decade that shows a major impact on convictions.

In spite of significant study into the issue, scholars are divided on reasons for the decline.

In most cases the crank is not well enough informed to write a paper with even a surface resemblance to a significant study.

The following are some of the significant studies conducted in the past:

He was a prolific composer, but to date no significant study has been undertaken of his music.

Orchid, herself, participated in one of the most significant studies.

A significant study of the line was published in three parts in 2011-12.

The boundaries of the block remain a topic of significant study.