NEURAL PARALLEL & SCIENTIFIC COMPUTATIONS, vol. 4, no. 3, page. 367 - 386, 1996-01
COMMUNICATIONS OF THE KOREAN MATHEMATICAL SOCIETY, vol. 8, no. 3, page. 545 - 554, 1993-01
NEURAL PARALLEL & SCIENTIFIC COMPUTATIONS, vol. 2, no. 1, page. 29 - 42, 1994-01