Helmer, S. M., Muellmann, S., Zeeb, H., & Pischke, C. R. (2016). Development and evaluation of the efficacy of a web-based ‘social norms’-intervention for the prevention and reduction of substance use in a cluster-controlled trial conducted at eight German universities. BMC Public Health.

Helmer, Stefanie M., Saskia Muellmann, Hajo Zeeb, and Claudia R. Pischke. "Development and Evaluation of the Efficacy of a Web-based ‘social Norms’-intervention for the Prevention and Reduction of Substance Use in a Cluster-controlled Trial Conducted At Eight German Universities." BMC Public Health 2016.

Helmer, Stefanie M., Saskia Muellmann, Hajo Zeeb, and Claudia R. Pischke. "Development and Evaluation of the Efficacy of a Web-based ‘social Norms’-intervention for the Prevention and Reduction of Substance Use in a Cluster-controlled Trial Conducted At Eight German Universities." BMC Public Health 2016.