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ILLINOIS JOURNAL OF MATHEMATICS, vol. 35, no. 3, page. 374 - 400, 1989-01

NAGOYA MATHEMATICAL JOURNAL, vol. 112, page. 117 - 124, 1988-12

JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 81, no. 2, page. 255 - 274, 1989-10

COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS, vol. 14, no. 6, page. 833 - 834, 1989-01

COMMUNICATIONS IN MATHEMATICAL PHYSICS, vol. 121, no. 1, page. 11 - 33, 1989-03

JOURNAL OF DYNAMICS AND DIFFERENTIAL EQUATIONS, vol. 1, no. 3, page. 269 - 298, 1989-07

LETTERS IN MATHEMATICAL PHYSICS, vol. 12, no. 2, page. 87 - 91, 1986-08

JOURNAL OF GEOMETRY AND PHYSICS, vol. 4, no. 2, page. 163 - 182, 1987-01

COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS, vol. 13, no. 12, page. 1499 - 1519, 1988-02

COMMUNICATIONS IN ALGEBRA, vol. 17, no. 3, page. 553 - 564, 1989-01