State Estimation Approach of Lithium-Ion Batteries by Simplified Ultrasonic Time-of-Flight Measurement. - Hartmut Popp; Markus Koller; Severin Keller; Gregor Glanz; Reinhard Klambauer; Alexander Bergmann (IEEE Access, 2019)

Determination of Lamb Wave Modes on Lithium-Ion Batteries Using Piezoelectric Transducers. - Markus Koller; Gregor Glanz; Alexander Bergmann; Hartmut Popp (Sensors, 2022)