Geodesic
Projective and injective unars
Dalʹnevostočnyj matematičeskij žurnal, Tome 24 (2024) no. 1, pp. 107-119

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In this paper we study projective and injective unars, as well as unars that satisfy conditions that are weakenings of the concepts of projectivity and injectivity. Namely, an algebraic description of projective, weakly-, quasi- and pseudo-projective, injective, weakly-, quasi- and pseudo-injective unars is given. 
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     author = {I. A. Sakharov},
     title = {Projective and injective unars},
     journal = {Dalʹnevosto\v{c}nyj matemati\v{c}eskij \v{z}urnal},
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     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {2024},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DVMG_2024_24_1_a9/}
}
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I. A. Sakharov. Projective and injective unars. Dalʹnevostočnyj matematičeskij žurnal, Tome 24 (2024) no. 1, pp. 107-119. http://geodesic.mathdoc.fr/item/DVMG_2024_24_1_a9/