MathSciNet bibliographic data MR1459640 81Q10 (47N50) Le Yaouanc, A.; Oliver, L.; Raynal, J.-C. The Hamiltonian $(p^2+m^2)^{1/2}-\alpha/r$$(p^2+m^2)^{1/2}-\alpha/r$ near the critical value $\alpha_c=2/\pi$$\alpha_c=2/\pi$. J. Math. Phys. 38 (1997), no. 8, 3997–4012. Article

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