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Bernd Billhardt

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2020 – today

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2021
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Bernd Billhardt, Paula Marques-Smith, Paula Mendes Martins:
Extensions of left regular bands by ℛ-unipotent semigroups. Period. Math. Hung. 83(2): 260-271 (2021)

2010 – 2019

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2013
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Bernd Billhardt, E. Giraldes, Paula Marques-Smith, Paula Mendes Martins:
Homomorphisms and congruences on regular semigroups with associate inverse subsemigroups. Period. Math. Hung. 66(2): 221-243 (2013)

1990 – 1999

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1995
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Bernd Billhardt:
Extensions of Regular Orthogroups by Inverse Semigroups. Int. J. Algebra Comput. 5(3): 317-342 (1995)

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