The Endomorphisms of L_p(0\le p\le 1) N. Kalton Indiana University Mathematics Journal 1978 text pdf 10.1512/iumj.1978.27.27027 10.1512/iumj.1978.27.27027 en Indiana Univ. Math. J. 27 (1978) 353 - 381 state-of-the-art mathematics http://iumj.org/access/