TY  - BOOK
AU  - Sargsyan,S.H.
AU  - Galstyan,G.F.
AU  - Petrosyan,H.G.
ED  - Ministry of education and science national polytechnic university of Armenia 
TI  - Basics of environment and ecology: Academic manual 
SN  - 978-9939-72-582-6
PY  - 2017///
CY  - Yerevan
PB  - Chartaraget
KW  - Basics of environment and ecology
KW  -  Manuals
N1  - References : p. 99-100
ER  -