He said that his department was concentrating its activities on the investigation in hand, for the time being.

"By definition, their activities are concentrated in a single state or region," he said.

In 1929 he decided to retire, concentrating his activities on the Institute.

Its main activities are concentrated in the areas of research, teaching and dissemination.

In the future these activities will not only be concentrated on local transits.

Most commercial and cultural activities are concentrated in the capital Sofia.

This was done most likely as a means to contain the Greeks and concentrate their activities in one place under his control.

Economic activity is highly concentrated among a few players.

Commercial activities are concentrated along the major avenues and at important intersections.