@article{10_21136_CPM_1990_108728,
     author = {Sova, Miroslav},
     title = {To the inversion of {G\r{a}rding} theorem},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {28--37},
     publisher = {mathdoc},
     volume = {115},
     number = {1},
     year = {1990},
     doi = {10.21136/CPM.1990.108728},
     mrnumber = {1044011},
     zbl = {0726.35037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1990.108728/}
}