https://9lib.net/document/z1d5l32e-sourceidentificationproblemsforpartialdifferentialequationshavebeengiveninvarious-hyperbolicequationsandofdifferenceschemesforapproximatesolutionofthehyperbolic-respecttothegridstepsandsuchtypeofstabilityinequalitiesforthesolutionsofthefirstorderofaccuracydiff.html