GiVl1987
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J. Ginibre, G. Velo, Conformal invariance and time decay for nonlinear wave equations I. Ann. Inst. Henri Poncare Phys. Theor. 47 (1987), 221-261.
J. Ginibre, G. Velo, Conformal invariance and time decay for nonlinear wave equations I. Ann. Inst. Henri Poncare Phys. Theor. 47 (1987), 221-261.