[1]
“Necessary Conditions for the Existence of a Saddle Point in one Optimal Control Problem for Systems of Hyperbolic Equations”,
Eur. J. Pure Appl. Math.
, vol. 14, no. 4, pp. 1402–1414, Nov. 2021, doi:
10.29020/nybg.ejpam.v14i4.4135
.