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SIPES, B. S., SCHMITT, D. P., & BARKER, K. R. (1992). FERTILITY OF 3 PARASITIC BIOTYPES OF HETERODERA-GLYCINES. PHYTOPATHOLOGY, 82(10), 999–1001. https://doi.org/10.1094/Phyto-82-999

Sipes, B. S., Schmitt, D. P., & Barker, K. R. (1992). Fitness components and selection of biotypes of Heterodera glycines. Journal of Nematology, 24(3), 415.