1. JGC; 8 Dragan Tsankov blvd. Sofia 1164 Bulgaria
2. Agrobioinstitute; 8 Dragan Tsankov blvd. Sofia 1164 Bulgaria
3. Center for Viticulture and Small Fruit Research, College of Agriculture and Food Sciences; Florida A & M University; Tallahassee FL USA
4. University of Food Technologies; 26 Maritsa blvd. Plovdiv 4000 Bulgaria