“Polychaetous worm with engine and wagons” by Fredrik Pleijel|[1]
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dx.doi.org
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Jones, Almut G. (janeiro de 1978). «Observations on Reproduction and Phenology in Some Perennial Asters». American Midland Naturalist. 99 (1): 184–97. JSTOR2424942. doi:10.2307/2424942
Woolley, D. J.; P. F. Wareing (Março de 1972). «The role of roots, cytokinins and apical dominance in the control of lateral shoot form in Solanum andigena». Planta. 105 (1): 33–42. PMID24477700. doi:10.1007/BF00385161
Aflatuni, Abbas; J. Uusitalo; S. Ek; A. Hohtola (janeiro de 2005). «Variation in the Amount of Yield and in the Extract Composition Between Conventionally Produced and Micropropagated Peppermint and Spearmint». Journal of Essential Oil Research. 17 (1): 66–70. ISSN1041-2905. doi:10.1080/10412905.2005.9698833