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@article{MZ_1967__102_170863, author = {Fred Richman and Elbert A. Walker}, title = {Cotorsion {Free,} an {Example} of {Relative} {Injectivity.}}, journal = {Mathematische Zeitschrift}, pages = {115--119}, publisher = {mathdoc}, volume = {102}, year = {1967}, zbl = {0178.02405}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__102_170863/} }
Fred Richman; Elbert A. Walker. Cotorsion Free, an Example of Relative Injectivity.. Mathematische Zeitschrift, Tome 102 (1967), pp. 115-119. http://geodesic.mathdoc.fr/item/MZ_1967__102_170863/