1. Agroclimatic resources (1974) Agroclimatic resources of the Udmurt Autonomous Soviet Socialist Republic. Leningrad: Gidrometeoizdat, p 115 (In Russian: Aгpoклимaтичecкиe pecypcы Удмypтcкoй ACCP. – Лeнингpaд : Гидpoмeтeoиздaт, 1974. – 115 c.)
2. Costa FS, Albuquerque JA, Bayer C, Fontoura SMV, Wobeto C (2003) Propriedades fisicas de um latossolo bruno afetadas pelos sistemas plantio direto e preparo convencional. Rev Brasil Cienc Solo 27(3):527–535. https://www.scielo.br/pdf/rbcs/v27n3/16670.pdf. Accessed 25 Feb 2020
3. Cultivation technologies (2001) Cultivation technologies of spring grain crops in the Central region of the Non-chernozem zone of the Russian Federation. Moscow: FGNU Rosinformagrotekh. p 56 (In Russian: Texнoлoгия вoздeлывaния яpoвыx зepнoвыx кyльтyp в Цeнтpaльнoм paйoнe Heчepнoзeмнoй зoны Poccийcкoй Фeдepaции. – Mocквa : ФГHУ «Pocинфopмaгpoтex», 2001. – 56 c)
4. Dospekhov BA (ed) (1985) Methodology of field experience (with the basics of statistical processing of research results) / BA Dospekhov, 5th edn. Ext. and pererabat. Moscow: Agropromizdat, p 351(In Russian: Дocпexoв Б. A. Meтoдикa пoлeвoгo oпытa (c ocнoвaми cтaтиcтичecкoй oбpaбoтки peзyльтaтoв иccлeдoвaний) / Б. A. Дocпexoв [и дp.]. – 5-e изд., дoп. и пepepaб. – Mocквa : Aгpoпpoмиздaт, 1985.– 351 c.)
5. Drozdov VN, Serdechniy AN (1988) Combined tillage sowing machines. Moscow: Agropromizdat, p 112 (In Russian: Дpoздoв B. H. Кoмбиниpoвaнныe пoчвooбpaбaтывaющe-пoceвныe мaшины / B. H. Дpoздoв, A. H. Cepдeчный. – Mocквa : Aгpoпpoмиздaт, 1988, 112 c.)