@article{TSG_1991__S9__119_0,
     author = {Ouyang, He},
     title = {On isospectral deformations on nilmanifolds},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {119--120},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {S9},
     year = {1991},
     language = {en},
     url = {http://www.numdam.org/item/TSG_1991__S9__119_0/}
}