Author: Biserka Yankova, Anyo Mitkov, Nesho Neshev, Mariyan Yanev, Tonyo Tonev
Scientific Works Academic Publishing House of the Agricultural University – Plovdiv
ISSN 1312-6318
Author: Biserka Yankova, Anyo Mitkov, Nesho Neshev, Mariyan Yanev, Tonyo Tonev