Assertion: hydrogen sulfide's number | /r/HasProperty | reported
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Source sentences:
text: A number of different H 2 S donors have been reported and the topic of H 2 S donors have been reviewed several times (Li et al., 2008; Zhao et al., 2014; Steiger et al., 2016; Zhao and Pluth, 2016; Zheng et al., 2016).