On a solvability condition for systems with an injective symbol in terms of iterations of double layer potentials. Shlapunov, A.A. — 2001 Sibirskij Matematicheskij Zhurnal
On duality in spaces of solutions to elliptic systems. Shlapunov, A.A. — 2002 Sibirskij Matematicheskij Zhurnal
The Cauchy problem for operators with injective symbol in the Lebesgue space L 2 in a domain. Shestakov, I.V.; Shlapunov, A.A. — 2009 Sibirskij Matematicheskij Zhurnal