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OHMAN JOHN H., 1964, WEEDS, V12, P222, DOI 10.2307/4040735
[13]
THOMAS PEL, 1968, P BRIT WEED CONTROL, V9, P737
[14]
WELBANK P. J., 1963, WEED RES, V3, P205, DOI 10.1111/j.1365-3180.1963.tb00237.x