@article{article, title = {{The sigma orientation is an H-infinity map}}, url = {{}}, year = {{2004}}, month = {{4}}, author = {{Ando M and Hopkins MJ and Strickland NP}}, volume = {{126}}, journal = {{AM J MATH}}, issue = {{2}}, pages = {{247-334}}, note = {{Accessed on 2025/04/11}}}