V. V. Vasil'ev, S. A. Lur'e, “Differential equations and the problem of singularity of solutions in applied mechanics and mathematics”, Prikl. Mekh. Tekh. Fiz., 64:1 (2023), 114–127; J. Appl. Mech. Tech. Phys., 64:1 (2023), 98–109
V. V. Vasil'ev, S. A. Lur'e, “Method of solving the equations of mathematical physics for conjugate domains”, Dokl. Akad. Nauk SSSR, 233:5 (1977), 831–834