ENTIRE SOLUTIONS OF QUASILINEAR SYMMETRIC SYSTEMS Mostafa Fazly Indiana University Mathematics Journal 2017 text pdf 10.1512/iumj.2017.66.6017 10.1512/iumj.2017.66.6017 en Indiana Univ. Math. J. 66 (2017) 361 - 400 state-of-the-art mathematics http://iumj.org/access/