no. 5
On the pythagoras numbers of real analytic surfaces
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 38 (2005) no. 5, pp. 751-772 
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     title = {On the pythagoras numbers of real analytic surfaces},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {751--772},
     year = {2005},
     publisher = {Elsevier},
     volume = {Ser. 4, 38},
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}
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Acquistapace, Francesca; Broglia, Fabrizio; Fernando, José F.; Ruiz, Jesús M. On the pythagoras numbers of real analytic surfaces. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 38 (2005) no. 5, pp. 751-772. doi: 10.1016/j.ansens.2005.04.001

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