This review contains 208 citation items from 31 countries in total. The highest number of citations come from Spain (34) then from the USA (23), Italy (18) and China (16). Only one citation comes from Denmark, Georgia, Macedonia, and New Zealand. They are all included into 16 topics arranged in alphabetical order. The results or conclusions of each study are briefly described and arranged according to the year of the publication and alphabetical order of the authors. The most important topic was the physiological research containing 40 citations and then the evaluation of cultivars containing 33 citations. From the years of the review, the most important was 2017 with 122 items, whereas the least prolific year was 2015 containing only 35 items.