Wat leuke linkjes verzameld over de variatie van tristis-roep:
http://www.elisanet.fi/antero.lindholm/Linnut/Phylloscopus/tristis/trcall.html (http://www.elisanet.fi/antero.lindholm/Linnut/Phylloscopus/tristis/trcall.html)
http://deanar.org.uk/tristis/tristis.htm#Vocalisations (http://deanar.org.uk/tristis/tristis.htm#Vocalisations)
http://iris.ut.ee/unite/temp/plutof2/uploads_taxa/SPT013415.MP3
http://www.xeno-canto.org/sounds/uploaded/LELYWQKUZX/XC148995-0922_093112-%D1%82%D0%BD%D1%8C%2C%20%D1%81%D0%B8%D0%B1%2C%20%D0%A1%206837%20%D0%B0.mp3
http://waarneming.nl/waarneming/view/45171015
http://waarneming.nl/waarneming/view/45564083
http://www.dutchbirding.nl/soundgallery.php?p=sounddetails&sid=212&page=zoek
[size=0pt]http://www.birdforum.net/showthread.php?t=103557 (http://www.birdforum.net/showthread.php?t=103557)[/size][/font]
http://birdingfrontiers.com/2013/01/02/siberian-chiffchaff-and-common-chiffchaff-part-2/