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Paper communicated by G. Lallement.
Dedicated to Professor L. M. Gluskin on his sixtieth birthday
The author gratefully acknowledges receipt of a Marquette University Summer Faculty Fellowship.
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Jones, P.R. A graphical representation for the free product of E-unitary inverse semigroups. Semigroup Forum 24, 195–221 (1982). https://doi.org/10.1007/BF02572768
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DOI: https://doi.org/10.1007/BF02572768