@article{EMJ_2024_15_2_a4,
     author = {V. I. Korzyuk and J. V. Rudzko},
     title = {Curvilinear parallelogram identity and mean-value property for a semilinear hyperbolic equation of the second order},
     journal = {Eurasian mathematical journal},
     pages = {61--74},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2024_15_2_a4/}
}