The Imbedding of Positive Hammerstein Integral Operators on Banach Lattices J. AntonJ. Casti Indiana University Mathematics Journal 1973 text pdf 10.1512/iumj.1973.22.22087 10.1512/iumj.1973.22.22087 en Indiana Univ. Math. J. 22 (1973) 1037 - 1047 state-of-the-art mathematics http://iumj.org/access/