She was banned because her testosterone levels were higher than those permitted for female athletes. The Court of Arbitration of Sport has ruled in her favour.
Inside an Olympian's testosterone ordeal – The Denver Post
Dutee Chand: On Her Mark - Forbes India
The Debate Dominating Women's Sports Right Now Has Nothing To Do
Dutee Chand, banned Indian runner, wins a big right for women athletes
Caster Semenya's case sets a big precedent for women's sport
Dutee Chand- #AsianPacificIslanderHeritageMonth — Compete Magazine
How India's Dutee Chand ran past gender barriers to compete in Rio
Hormone Levels Are Being Used to Discriminate against Female
What Qualifies a Woman to Compete as a Woman? An Ugly Fight