For citations:
Stupakova G.A., Ignatyeva E.E., Shchipletsova T.I., Mitrofanov D.K. Development ot a black-earth soil reterence material, tested tor fertility indicators. Measurement Standards. Reference Materials. 2019;15(4):33-40. (In Russ.) https://doi.org/10.20915/2077-1177-2019-15-4-33-40
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