You can embed HTML tags directly in Markdown documents. To switch the "supercrypting" mode, use sup.
MyTitle
========================================================
J.Smith<sup>1</sup>, K.John<sup>2</sup>, H.Gone<sup>*</sup>.
EDIT . You can also use parentheses to precisely indicate the portion of text to be reformatted.
J.Smith^(1), K.John^(2), H.Gone^(*)
EDIT: Markdown V2
2^10
2^(10)
2^10^
2^(10)^
