This started the so-called "classic period" of Wonder's career during the 1970s.

"I'm not sure the works I've done since my so-called avant-garde period are less adventurous," he said.

The trio was written late in the composer's so-called "middle period".

Most modern scholars agree that it was written mostly during Plato's so-called middle period.

Few examples are from the so-called "classical period," that is, pre-1800.

It is one of the last works of Beethoven's so-called "early period".

The proposed revisions to the so-called quiet period, if adopted, would let companies provide more information to investors.

It is referred to as his so-called dark or sombre period.

A church that is declared redundant enters the so-called 'Waiting period'.

The so-called look-back period used to be 30 months.