HAENSEL, S., USTRNUL, Z., LUPIKASZA, E., SKALÁK, P. Assessing seasonal drought variations and trends over Central Europe. Advances in Water Resources. 2019, 127(may), 53-75. ISSN 0309-1708. E-ISSN 1872-9657. Available: https://doi.org/10.1016/j.advwatres.2019.03.005.