Information Processing Letters
Information Processing Letters > 1995 > 53 > 3 > 141-143
Information Processing Letters > 1995 > 53 > 4 > 229-234
Information Processing Letters > 1995 > 54 > 6 > 317-322
Information Processing Letters > 1995 > 53 > 3 > 141-143
Information Processing Letters > 1995 > 53 > 4 > 229-234
Information Processing Letters > 1995 > 54 > 6 > 317-322