Geodesic
On $\mathfrak{U}$-$\mathfrak{L}$-purity in Abelian groups
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1982), pp. 11-18

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We give a complete description of the classes of $\mathfrak{U}$-$\mathfrak{L}$-divisible, $\mathfrak{U}$-$\mathfrak{L}$-flat, $\mathfrak{U}$-$\mathfrak{L}$-injective and $\mathfrak{U}$-$\mathfrak{L}$-projective groups. 
@article{VMUMM_1982_2_a3,
     author = {S. I. Komarov},
     title = {On $\mathfrak{U}$-$\mathfrak{L}$-purity in {Abelian} groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {11--18},
     publisher = {mathdoc},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_2_a3/}
}
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S. I. Komarov. On $\mathfrak{U}$-$\mathfrak{L}$-purity in Abelian groups. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1982), pp. 11-18. http://geodesic.mathdoc.fr/item/VMUMM_1982_2_a3/