SOLUTIONS TO THE SINGULAR $\sigma_2$--YAMABE PROBLEM WITH ISOLATED SINGULARITIES Almir Silva Santos Indiana University Mathematics Journal 2017 text pdf 10.1512/iumj.2017.66.6032 10.1512/iumj.2017.66.6032 en Indiana Univ. Math. J. 66 (2017) 741 - 790 state-of-the-art mathematics http://iumj.org/access/