@article{10_4153_CMB_1976_042_4,
     author = {Bynum, W. L.},
     title = {Weak {Parallelogram} {Laws} for {Banach} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {269--275},
     year = {1976},
     volume = {19},
     number = {3},
     doi = {10.4153/CMB-1976-042-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-042-4/}
}