@article{GDZPPN002234904, title = {Relative coherence and preenvelopes.}, journal = {Manuscripta mathematica}, volume = {79}, year = {1993}, pages = {243-262}, zbl = {0802.16023}, url = {http://dml.mathdoc.fr/item/GDZPPN002234904} }
Ding, Nanqing; Chen, Jianlong. Relative coherence and preenvelopes.. Manuscripta mathematica, Tome 79 (1993) pp. 243-262. http://gdmltest.u-ga.fr/item/GDZPPN002234904/