Widén, C., Sarvela, J., & Ahti, T. (1967). The Dryopteris Spinulosa Complex in Finland. Soc. pro fauna et flora Fennica.
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Chicago Style (17th ed.) Citation
Widén, Carl-Johan, Jaakko Sarvela, and Teuvo Ahti. The Dryopteris Spinulosa Complex in Finland. Helsinki: Soc. pro fauna et flora Fennica, 1967.
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MLA (9th ed.) Citation
Widén, Carl-Johan, et al. The Dryopteris Spinulosa Complex in Finland. Soc. pro fauna et flora Fennica, 1967.
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Warning: These citations may not always be 100% accurate.