@article{COCV_2013__19_1_255_0,
     author = {L\"u, Qi},
     title = {A lower bound on local energy of partial sum of eigenfunctions for {Laplace-Beltrami} operators},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {255--273},
     publisher = {EDP-Sciences},
     volume = {19},
     number = {1},
     year = {2013},
     doi = {10.1051/cocv/2012008},
     mrnumber = {3023069},
     zbl = {1258.93035},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv/2012008/}
}