Kalwij, Jesse M.; Robertson, Mark P.; van Rensburg, Berndt J. (2015-09-16). "Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem". Biological Invasions. 17 (12): 3517–3529. doi:10.1007/s10530-015-0975-3. hdl:2263/50270. ISSN1387-3547. S2CID16237728.
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Kalwij, Jesse M.; Robertson, Mark P.; van Rensburg, Berndt J. (2015-09-16). "Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem". Biological Invasions. 17 (12): 3517–3529. doi:10.1007/s10530-015-0975-3. hdl:2263/50270. ISSN1387-3547. S2CID16237728.
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Kalwij, Jesse M.; Robertson, Mark P.; van Rensburg, Berndt J. (2015-09-16). "Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem". Biological Invasions. 17 (12): 3517–3529. doi:10.1007/s10530-015-0975-3. hdl:2263/50270. ISSN1387-3547. S2CID16237728.
Kalwij, Jesse M.; Robertson, Mark P.; van Rensburg, Berndt J. (2015-09-16). "Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem". Biological Invasions. 17 (12): 3517–3529. doi:10.1007/s10530-015-0975-3. hdl:2263/50270. ISSN1387-3547. S2CID16237728.