@article{AM2_1982__24_136925,
     author = {Pham Son},
     title = {Embedding quasi-metric spaces in {Hilbert} spaces.},
     journal = {Aequationes mathematicae},
     pages = {39--46},
     publisher = {mathdoc},
     volume = {24},
     year = {1982},
     zbl = {0533.46005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__24_136925/}
}