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Dambacher, Jeffrey M.; Li, Hiram W.; Rossignol, Philippe A. (2002). "Relevance of community structure in assessing indeterminacy of ecological predictions". Ecology. 83 (5): 1372–1385. doi:10.1890/0012-9658(2002)083[1372:rocsia]2.0.co;2. JSTOR3071950.
Dambacher, Jeffrey M.; Li, Hiram W.; Rossignol, Philippe A. (2002). "Relevance of community structure in assessing indeterminacy of ecological predictions". Ecology. 83 (5): 1372–1385. doi:10.1890/0012-9658(2002)083[1372:rocsia]2.0.co;2. JSTOR3071950.
Morrissette, Julian O.; Jahnke, John C. (1967). "No relations and relations of strength zero in the theory of structural balance". Human Relations. 20 (2): 189–195. doi:10.1177/001872676702000207. S2CID143210382.