Nilsen, E. T.; Clinton, B. D.; Lei, T. T.; Miller, K.; Semones, S. W.; Walker, J. F. (2001). "Does Rhododendron maximum L. (Ericaceae) reduce the availability of resources above and belowground for canopy tree seedlings?". American Midland Naturalist. 145 (2): 325–343. doi:10.1674/0003-0031(2001)145[0325:DRMLER]2.0.CO;2. S2CID7021773.
Nilsen, E. T.; Walker, J. F.; Miller, O. K.; Semones, S. W.; Lei, T. T.; Clinton, B. D. (1999). "Inhibition of seedling survival under Rhododendron maximum (Ericaceae): could allelopathy be a cause?". American Journal of Botany. 86 (11): 1.597 –1.605. doi:10.2307/2656796. JSTOR2656796.
Nilsen, E. T.; Walker, J. F.; Miller, O. K.; Semones, S. W.; Lei, T. T.; Clinton, B. D. (1999). "Inhibition of seedling survival under Rhododendron maximum (Ericaceae): could allelopathy be a cause?". American Journal of Botany. 86 (11): 1.597 –1.605. doi:10.2307/2656796. JSTOR2656796.
Nilsen, E. T.; Clinton, B. D.; Lei, T. T.; Miller, K.; Semones, S. W.; Walker, J. F. (2001). "Does Rhododendron maximum L. (Ericaceae) reduce the availability of resources above and belowground for canopy tree seedlings?". American Midland Naturalist. 145 (2): 325–343. doi:10.1674/0003-0031(2001)145[0325:DRMLER]2.0.CO;2. S2CID7021773.