Gryshchuk, S. “Biharmonic Continuations of Gradients With the Help of Monogenic Functions With Values in the Biharmonic Algebra”. Ukrains’kyi Matematychnyi Zhurnal, vol. 76, no. 4, Apr. 2024, pp. 487-01, https://doi.org/10.3842/umzh.v74i4.7867.