no. 1
Eigenvalues of the laplacian of compact Riemann surfaces and minimal submanifolds
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 7 (1980) no. 1, pp. 55-63. 
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     author = {Yang, Paul C. and Yau, Shing-Tung},
     title = {Eigenvalues of the laplacian of compact {Riemann} surfaces and minimal submanifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {55--63},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 7},
     number = {1},
     year = {1980},
     zbl = {0446.58017},
     mrnumber = {577325},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1980_4_7_1_55_0/}
}
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Yang, Paul C.; Yau, Shing-Tung. Eigenvalues of the laplacian of compact Riemann surfaces and minimal submanifolds. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 7 (1980) no. 1, pp. 55-63. http://www.numdam.org/item/ASNSP_1980_4_7_1_55_0/

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