@article{10_4153_CMB_2011_110_3,
     author = {Gigli, Nicola and Ohta, Shin-Ichi},
     title = {First {Variation} {Formula} in {Wasserstein} {Spaces} over {Compact} {Alexandrov} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {723--735},
     year = {2012},
     volume = {55},
     number = {4},
     doi = {10.4153/CMB-2011-110-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-110-3/}
}