prov:value
| - ISSN 1807-0302. <a href="http://dx.doi.org/10.1590/S1807-03022009000200002.In">http://dx.doi.org/10.1590/S1807-03022009000200002.In</a> this paper, we study the nonlinear equation of the form where is the ultra-hyperbolic operator iterated k-times, defined by , p + q = n is the dimension of the Euclidean space n, (x, t) = (x1, x2,..., xn, t) n?? (0, ), k is a positive integer and c is a positive constant.
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