Geodesic
The Klein bottle group is not strongly verbally closed, though awfully close to being so
Canadian mathematical bulletin, Tome 64 (2021) no. 2, pp. 491-497

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DOI

According to Mazhuga’s theorem, the fundamental group H of anyconnected surface, possibly except for the Klein bottle, is a retract of each finitely generated group containing H as a verbally closed subgroup. We prove that the Klein bottle group is indeed an exception but has a very close property.
DOI : 10.4153/S0008439520000582
Mots-clés : Verbally closed subgroups, surface groups 
Klyachko, Anton A. The Klein bottle group is not strongly verbally closed, though awfully close to being so. Canadian mathematical bulletin, Tome 64 (2021) no. 2, pp. 491-497. doi: 10.4153/S0008439520000582
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     title = {The {Klein} bottle group is not strongly verbally closed, though awfully close to being so},
     journal = {Canadian mathematical bulletin},
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     year = {2021},
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