The timing-dependent effects of stress-induced cortisol release on evaluative conditioning
G. Halbeisen, B. Buttlar, S.-M. Kamp, E. Walther, International Journal of Psychophysiology 152 (2020) 44–52.

Virtually stressed? A refined virtual reality adaptation of the Trier Social Stress Test (TSST) induces robust endocrine responses
P. Zimmer, B. Buttlar, G. Halbeisen, E. Walther,  Gregor Domes, Psychoneuroendocrinology 101 (2019) 186–192.