Ake Nygren

Psychometric properties of scales in the General Nordic Questionnaire for Psychological and Social Factors at Work (QPS): confirmatory factor analysis and prediction of certified long-term sickness absence.

M. Åsberg, J. Gustavsson, Ingrid Wännström, 2009, Scandinavian journal of psychology.

Burnout Levels and Self-Rated Health Prospectively Predict Future Long-Term Sickness Absence: A Study Among Female Health Professionals

Petter Gustavsson, Gunnar Bergström, Evangelia Demerouti, 2011, Journal of occupational and environmental medicine.

Reflecting peer-support groups in the prevention of stress and burnout: randomized controlled trial.

Gunnar Bergström, M. Åsberg, Ulla Peterson, 2008, Journal of advanced nursing.