@article{10_4153_S0008439521000564,
     author = {Kad{\textquoteright}ourek, Ji\v{r}{\'\i}},
     title = {On semidirectly closed pseudovarieties of finite semigroups and monoids},
     journal = {Canadian mathematical bulletin},
     pages = {612--627},
     year = {2022},
     volume = {65},
     number = {3},
     doi = {10.4153/S0008439521000564},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439521000564/}
}