found: Work cat.: Pontin, A. J. Competition and coexistence of species, 1982.
found: Encyclopedia of Evolution, Oxford University Press 2003, via Oxford Refernce Online, June 7, 2010:Population dynamics article, section on competition (... coexistence is promoted only if the effects of competition within a species are greater than the effects of the competition acting between species. Understanding the ecological processes that alleviate interspecific competition and allow coexistence has been a recurrent theme in population ecology.) Summary (The principles of population dynamics are founded on four key processes ... This quantitative understanding of population processes provides a framework within which the dynamics, interactions, and coexistence of species can be comprehended.)
found: Merriam-Webster unabridged online, Feb. 5, 2015(Sympatric (adj.): occupying or taking place in the same area, <a sympatric distribution of two species>; specifically: capable of occupying the same range without loss of identity due to interbreeding; noun: sympatry)
found: Tarver, Richard David. A diachronic analysis of Plio-Pleistocene hominin contemporaneity in Africa and Europe, 2015 [thesis]:page x (A majority of extant primates are observed to live in sympatry with one or more species)