@article{1183535295,
author = {V\'yborn\'y, R.},
title = {The Hadamard three-circles theorems for partial differential equations},
journal = {Bull. Amer. Math. Soc.},
volume = {80},
number = {4},
year = {1974},
pages = { 81-84},
language = {en},
url = {http://dml.mathdoc.fr/item/1183535295}
}
Výborný, R. The Hadamard three-circles theorems for partial differential equations. Bull. Amer. Math. Soc., Tome 80 (1974) no. 4, pp. 81-84. http://gdmltest.u-ga.fr/item/1183535295/