by Weiss, S.M., Apte, C., Damerau, F.J., Johnson, D.E., Oles, F.J., Goetz, T., Hampp, T.
Published in IEEE intelligent systems & their applications (01.07.1999)

by Weiss, S.M., White, B.F., Apte, C.V., Damerau, F.J.
Published in IEEE intelligent systems & their applications (01.03.2000)