For citations:

Ulitin M.M., Besschetnov V.P. Seasonal changes in the pigment composition of needles of representatives of the genus spruce in the Nizhny Novgorod region. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2021;(237):131-150. (In Russ.) https://doi.org/10.21266/2079-4304.2021.237.131-150