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3. M. Sh. Birman and M. Z. Solomyak, “Double Stieltjes operator integrals. II,” in: Probl. Mat. Fiz., No. 2. Spectral Theory, Diffraction Problems, Izdat. Leningrad. Univ., Leningrad, 1967, 26–60; English transl.: in: Topics in Math. Phys., vol. 2, Consultants Bureau, New York, 1968, 19–46.
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5. M. Sh. Birman and M. Z. Solomyak, “Double Stieltjes operator integrals. III [in Russian],” in: Probl. Mat. Fiz., No. 6. Theory of Functions. Spectral Theory. Wave Propagation, Izdat. Leningrad. Univ., Leningrad, 1973, 27–53.