Petrowski Katja, Wendt Katharina, Wichmann Susann, Siepmann Martin, A Randomized Controlled Biofeedback Intervention Study On Heart Rate Variability In Unemployed Subjects, Journal of Depression and Therapy, Volume 1, Issue 3, 2017, Pages 18-28, ISSN 2476-1710, https://doi.org/10.14302/issn.2476-1710.jdt-16-1332. (https://openaccesspub.orgjdt/article/442) Keywords: heart rate variability; RMSSD; biofeedback; unemployment