"in this article" is correct and usable in written English. You can use it when referring to a specific article that you are either writing or referencing. For example, "In this article, we will discuss the benefits of using solar energy for homes.".
Loads of pictures in this article.
This distinction is applied in this article.
Four subfamilies are recognized in this article.
Why is this important in this article?
In this article, there's nothing for sale.
Read why in this article.
There are two watches in this article.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia