On the Mapping Problem for Quadric Cauchy-Riemann Manifolds A. Sukhov Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42003 10.1512/iumj.1993.42.42003 en Indiana Univ. Math. J. 42 (1993) 27 - 36 state-of-the-art mathematics http://iumj.org/access/