What are the other novels by S. E. Hinton that include the characters such as Ponyboy Curtis?

I just read The Outsiders. Absolutely love it. If you have not read it yet, i really reccomend you to, the movie doesnt do the book any justice. But my teacher said that some of her other books she has written have some characters from The Outsiders. I would like to know them because i really want to read them. Thanks!!!