1. 1. Dilung I.I., Karpitskaya V.E. 1963. Chlorophyll a photochemical oxidation in freozen solutions. DAN USSR. 152 : 367-369.
2. 2. Orlov D.S., Sadovnikova L.K., Lozanovskaya I.N. 2002. Ecology and biosphere protection under chemical pollution. (Ekologiya i okhrana biosfery pri khimicheskom zagryaznenii). Moscow : 334 p.
3. 3. Syvash O.O., Zolotareva E.K. 2013. Chlorophyll catabolism in plants. Bull. Kharkiv. Natl. Agrar. Univ. Ser. Biology. (Visnyk Kharkiv. Natsional. Agrarn. Univer. Ser. Biologiya). 3 (30) : 6-17.
4. 4. Syvash O.O., Fomishyna R.N., Zakharova T.O., Zolotareva E.K. 2016. Chlorophyllase activity and pigment composition in leaves of forest plants of different layers of broad-leaved forest. Bull. Kharkiv. Natl. Agrar. Univ. Ser. Biology. (Visnyk Kharkiv. Natsional. Agrarn. Univer. Ser. Biologiya). 2 (38) : 75-83.
5. 5. Topchiy N.M. Effect of heavy metals on photosynthesis. 2010. Fiziologiya i Biokhimiya Kult. Rastenii. 42 (2) : 95-106.