A Power Variance Test for Nonstationarity in Complex-Valued Signals. - Thomas E. Bartlett; Adam M. Sykulski; Sofia C. Olhede; Jonathan M. Lilly; Jeffrey J. Early (ICMLA, 2015)

Frequency-Domain Stochastic Modeling of Stationary Bivariate or Complex-Valued Signals. - Adam M. Sykulski; Sofia Charlotta Olhede; Jonathan M. Lilly; Jeffrey J. Early (IEEE Trans. Signal Process., 2017)