@article{CML_2011__3_3_445_0,
     author = {Lee Keyfitz, Barbara},
     title = {Singular shocks: retrospective and prospective
},
     journal = {Confluentes Mathematici},
     pages = {445--470},
     publisher = {World Scientific Publishing Co Pte Ltd},
     volume = {3},
     number = {3},
     year = {2011},
     doi = {10.1142/S1793744211000424},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1142/S1793744211000424/}
}