Poulton, P.R. Why are long-term experiments important? / P. R. Poulton. — с.153-162. — Электрон. текстовые дан. // Izvestia of Timiryazev - Academy: Scientific-theoretical Journal of the Russian State Agrarian University - Moscow Agricultural Academy named after K.A. Timiryazev. – 2013. – Вып. special issue. — Коллекция: Журнал «Известия ТСХА». — http://elib.timacad.ru/dl/full/16-2013-eng.pdf. - Загл. с титул. экрана. — <URL:http://elib.timacad.ru/dl/full/16-2013-eng.pdf>.
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