... LLC126 Integrated Assessment of Health and Sustainability of Agroecosystems Klee, V. (1 989 ). Sign-pattern and stability. In Applications of Combinatorics and Graph The-ory to the Biological and ... Integrated Assessment of Health and Sustainability of Agroecosystems total degrees of 8, 7, and 7, respectively. Nine of the vertices (1, 8, 12, 20, 21, 22, 29, 30, and 31) are sources, and none is a ... LLC92 Integrated Assessment of Health and Sustainability of Agroecosystems (Ackoff, 1 980 ). A mess is a complex of interrelated problems in which there is no common agreement about the nature of...