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

ILLINOIS JOURNAL OF MATHEMATICS, vol. 33, no. 3, page. 495 - 530, 1989-01

STUDIA MATHEMATICA, page. 285 - 293, 1989-01

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

PUSAN KYONGNAM MATHEMATICAL JOURNAL, vol. 4, page. 101 - 106, 1988-06

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

SIAM JOURNAL ON NUMERICAL ANALYSIS, vol. 25, no. 1, page. 46 - 53, 1988-02

BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY, vol. 25, no. 1, page. 1 - 4, 1988-01

PORTUGALIAE MATHEMATICA, vol. 45, no. 3, page. 273 - 293, 1988-01

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

JAPAN ACADEMY. PROCEEDINGS. SERIES A: MATHEMATICAL SCIENCES, vol. 63, no. 6, page. 222 - 224, 1987-01

MAT. APL. COMPUT, vol. 5, no. 3, page. 249 - 264, 1987-01

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