@article{MZM_1993_54_2_a11,
     author = {V. G. Tkachev},
     title = {A sharp lower bound for the first eigenvalue on a minimal surface},
     journal = {Matemati\v{c}eskie zametki},
     pages = {99--107},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_2_a11/}
}