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群(英语:Rudvalis group) R u {\displaystyle Ru} ; 铃木散在群(英语:Suzuki sporadicgroup) S u z {\displaystyle Suz} 或 F 3 − {\displaystyle F_{3-}} ; O'Nan 群(英语:O'Nan group) O
Times-News. 1991-06-09. Sanger, David E. Volcano Erupts After Months of Sporadic Activity. Star-News 124 (200). 1991-06-04: 1 [2015-12-16]. (原始内容存档于2020-07-23)
PMID 12934968 (英语). Braak H, Del Tredici K. Where, when, and in what form does sporadic Alzheimer's disease begin?. Current Opinion in Neurology. 2012-12, 25 (Pt