Frank Pillmann

Agreement of different methods for assessing sleep characteristics: a comparison of two actigraphs, wrist and hip placement, and self-report with polysomnography.

Thomas Penzel, Wolfgang Ahrens, Ingo Fietze, 2014, Sleep medicine.

Transitions in effective scaling behavior of accelerometric time series across sleep and wake

Thomas Penzel, Patrick Wohlfahrt, Jan W. Kantelhardt, 2013 .