I need these papers please
Y.J.LIU and F.J.RIZZO
HYPERSINGULAR BOUNDARY INTEGRAL EQUATIONS FOR RADIATION AND......
COMPUTER METHODS APL. ENG. 1993, 131-144]
A.PORTELA, M.H.ALIABADI and D.P.ROKE
THE DUAL BOUNDARY ELEMENT METHOD-EFFECTVE IMPLEMENTATION FOR CRACK PROBLEMS.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEEING, 33,6,1269-1287,1992.
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