For citations:

Viunkov S.N., Vasilyev V.V. Modification of the hardener of urea-formaldehyde resins with a low molar ratio of formaldehyde to urea. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(243):284-296. (In Russ.) https://doi.org/10.21266/2079-4304.2023.243.284-296