Market studies of various key markets are published at irregular intervals.

They now came at irregular intervals, and there were not many of them.

In addition, from 1949-1975, a number of supplements were published at irregular intervals.

Though he did continued to play tournaments at irregular intervals.

To this day, the university is shut down at irregular intervals by the government.

Seven issues were published at irregular intervals between 1961 and 1968.

"At irregular intervals for some six rounds of our sun, now."

It was created in 1986 and is given at irregular intervals.

Several of these lay at irregular intervals around their destination.

People had done so, of course, at irregular intervals over the years.