The expanding telephone number Part 1: Keying briefly presented multiple-digit numbers. - Knut Nordby; Ruth Kjærsti Raanaas; Svein Magnussen (Behav. Inf. Technol., 2002)

The expanding telephone number Part 2: Age variations in immediate memory for multiple-digit numbers. - Ruth Kjærsti Raanaas; Knut Nordby; Svein Magnussen (Behav. Inf. Technol., 2002)

ETSI's human factors contribution to eEurope. - Bruno Niman; Knut Nordby (Univers. Access Inf. Soc., 2004)