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Engel, Volker; Fischer, Melanie K.; Wäckers, Felix L.; Völkl, Wolfgang (December 2001). "Interactions between extrafloral nectaries, aphids and ants: are there competition effects between plant and homopteran sugar sources?". Oecologia. 129 (4): 577–584. Bibcode:2001Oecol.129..577E. doi:10.1007/s004420100765. PMID24577698. S2CID7363980.
Engel, Volker; Fischer, Melanie K.; Wäckers, Felix L.; Völkl, Wolfgang (December 2001). "Interactions between extrafloral nectaries, aphids and ants: are there competition effects between plant and homopteran sugar sources?". Oecologia. 129 (4): 577–584. Bibcode:2001Oecol.129..577E. doi:10.1007/s004420100765. PMID24577698. S2CID7363980.
Engel, Volker; Fischer, Melanie K.; Wäckers, Felix L.; Völkl, Wolfgang (December 2001). "Interactions between extrafloral nectaries, aphids and ants: are there competition effects between plant and homopteran sugar sources?". Oecologia. 129 (4): 577–584. Bibcode:2001Oecol.129..577E. doi:10.1007/s004420100765. PMID24577698. S2CID7363980.
Engel, Volker; Fischer, Melanie K.; Wäckers, Felix L.; Völkl, Wolfgang (December 2001). "Interactions between extrafloral nectaries, aphids and ants: are there competition effects between plant and homopteran sugar sources?". Oecologia. 129 (4): 577–584. Bibcode:2001Oecol.129..577E. doi:10.1007/s004420100765. PMID24577698. S2CID7363980.