@article{CMH_1994__69_4_140334,
     author = {S.T. Yau and J.-P. Bourguignon and P. Li},
     title = {Upper bound for the first eigenvalue of algebraic submanifolds.},
     journal = {Commentarii mathematici Helvetici},
     pages = {199--207},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {1994},
     zbl = {0814.53040},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140334/}
}