Burchardt LS, Knörnschild M. Comparison of methods for rhythm analysis of complex animals? acoustic signals Gershman SJ, ed.  2020. Available at: https://dx.plos.org/10.1371/journal.pcbi.1007755.

Wirthlin M, Chang EF, Knörnschild M, et al. A Modular Approach to Vocal Learning: Disentangling the Diversity of a Complex Behavioral Trait. Neuron. 2019;104(1):87 - 99.