Referring to research
Researchers have identified three key issues here, they are … Researchers have shown quite conclusively that …
A number of recent studies, notably the ones by … and …, have shown that …
A number of studies have shown that ...
A study by … shows that ... Research suggests/indicates that … According to …
Figures from … show/suggest/indicate that ...
A very interesting study by … shows that…
The study by … is on your reading list and I encourage you to take a look at it. Basically, what
he found was that …
One of the most interesting studies carried out in this area by … showed that …