Author: Tsvetelina Nikolova, Krasimira Avramova, Dimitar Grekov,
Krasimira Malinova
Scientific Works Academic Publishing House of the Agricultural University – Plovdiv
ISSN 1312-6318
Author: Tsvetelina Nikolova, Krasimira Avramova, Dimitar Grekov,
Krasimira Malinova