Liu, P., Zhang, Q., Zhang, C., Zhu, Y., Khairoutdinov, M., Kim, H. M., … & Zhang, M. (2015). A Revised Real-Time Multivariate MJO Index. Monthly Weather Review, (2015).
Feng, J., Liu, P., Chen, W., & Wang, X. (2014). Contrasting Madden–Julian Oscillation activity during various stages of EP and CP El Niños. Atmospheric Science Letters.