@article{PORMA_2002__59_4_50604,
     author = {Lu, Zhiqin},
     title = {On the rigidity of horizontal slices.},
     journal = {Portugaliae mathematica},
     pages = {409--433},
     publisher = {mathdoc},
     volume = {59},
     number = {4},
     year = {2002},
     zbl = {1032.32010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2002__59_4_50604/}
}