@article{MS2_1975__37_166442,
     author = {Ingegerd Palm\'er},
     title = {The global homological dimension of semi-trival extensions of rings.},
     journal = {Mathematica Scandinavica},
     pages = {223--256},
     publisher = {mathdoc},
     volume = {37},
     year = {1975},
     zbl = {0327.16018},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__37_166442/}
}