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Communicated by László Márki.
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Almeida, J., Perrin, D. Gérard Lallement (1935–2006). Semigroup Forum 78, 379–383 (2009). https://doi.org/10.1007/s00233-009-9155-z
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DOI: https://doi.org/10.1007/s00233-009-9155-z