Assertion: lignin's number | /r/HasProperty | gratzl
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Source sentences:
text: A number of excellent reviews dealing with various aspects of these phenomena have previously been published (Gratzl 1985; Heitner 1993; Leary 1994; Davidson 1996; Forsskåhl 2000; Lanzalunga and Bietti 2000; Heitner 2010).