Geodesic
Hall varieites of semigroups
Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 463-470.

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We describe varieties $\mathfrak{B}$ of semigroups such that every retract of a semigroup which is free in $\mathfrak{B}$ is either one-element or free in $\mathfrak{B}$. 
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     author = {L. A. Skornyakov},
     title = {Hall varieites of semigroups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {463--470},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a13/}
}
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L. A. Skornyakov. Hall varieites of semigroups. Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 463-470. http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a13/