Kashfiyot
Xizmatlar
Identifikatsiya
Ishlab chiquvchilar uchun
Ekotizim
2 ta ish
Sofia University "St. Kliment Ohridski"
Slavka Georgieva, S. P. McGrath, D. J. Hooper +1
G. W. Yeates, Tom Bongers, R.G.M. de Goede +2