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"Akihiro Ishibashi,Hideki Ishihara","Equation of motion for a domain wall coupled to gravitational field",,"Phys.Rev. D",,"Vol. 60",,"pp. 124016",1999,
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"H.Ishihara,H.Nariai","Some Comments on a Stability of the $\tilde S<sup>2\times S</sup>2$-type     Space-Time",,"Prog.Theor.Phys.",,"Vol. 70",,"pp. 1148",1983,
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