New challenges for the organization of night and shift work: Proceedings of the XIII International Symposium on Night and Shift Work, 23–27 June 1997, Finland - Härmä, Mikko; Barton, J.; Costa, Giovanni; Greenwood, K.; Knauth, Peter; Nachreiner, F.; Rosa, R.; Åkerstedt, Torbjörn (Scandinavian Journal of Work, Environment & Health, 1998)