It has been studied since at least the 18th century and still is.

It has also been known as one of the most sought after school to study in ever since the 80s.

He studied law since the next year and finished in 1871.

It has been studied since the 1890s but many fundamental questions remain about this process.

He had not studied so much since his days in the trustee school.

She has been studying at least 30 minutes a day since late August, working from her laptop.

She has traveled to study the situation in Chechnya several times since 1993.

I am probably the world's leading authority on the subject, having studied it since my childhood days.

Monthly water balance models had been studied since the 1940s.

Incremental search has been studied at least since the late 1960s.