by CRUZ SOTO, J. L, CALZADA CANALEJO, M. C, MARTIN BELTRAN, M, FERNANDEZ-CARA, E
Published in Computers & mathematics with applications (1987) (01.05.1993)

by Arribas Blanco, J.M., Rodríguez Pata, N., Esteve Arrola, B., Beltrán Martín, M.
Published in Semergen, medicina de familia (2001)