@article{BSMF_1968__96__41_0,
     author = {Yuan, S.},
     title = {On logarithmic derivatives},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {41--52},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {96},
     year = {1968},
     doi = {10.24033/bsmf.1659},
     mrnumber = {38 #5764},
     zbl = {0184.06801},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1659/}
}