Popova V., Daly E.J., Trivedi M., Cooper K., Lane R., Lim P., Mazzucco C., Hough D., Thase M.E., Shelton R.C., Molero P., Vieta E., Bajbouj M., Manji H., Drevets W.C., Singh J.B.(2019).  Efficacy and Safety of Flexibly Dosed Esketamine Nasal Spray Combined With a Newly Initiated Oral Antidepressant in Treatment-Resistant Depression: A Randomized Double-Blind Active-Controlled Study. American Journal of Psychiatry 176:428-438.