@article{10_21136_CMJ_1991_102499,
     author = {Albrecht, Ulrich F.},
     title = {Extension functors on the category of $A$-solvable abelian groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {685--694},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {1991},
     doi = {10.21136/CMJ.1991.102499},
     mrnumber = {1134957},
     zbl = {0776.20018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102499/}
}