Kautz, H.; Selman, B. & Shah, M. (1997), 'Referral Web: combining social networks and collaborative filtering', Commun. ACM 40(3), 63--65.

Kautz, H.; Selman, B. & Shah, M. (1997), 'Referral Web: combining social networks and collaborative filtering', Commun. ACM 40(3), 63--65.

Kautz, H.; Selman, B. & Shah, M. (1997), 'Referral Web: combining social networks and collaborative filtering', Communications of the ACM 40(3), 63--65.