C. Lenza

Middle to Upper Ordovician graptolite biostratigraphy of Peel River and other areas of the northern Canadian Cordillera

Chen Xu, C. Lenza, 1985 .

Correlation of Ashgill graptolite faunas of central China and arctic Canada，with a description of Diceratograptus cf. mirus Mu from Canada

Chen Xu, C. Lenza, 1984 .

Uppermost Wenlock and Ludlow graptolites from southern Yunnan, China

Zhang Yuandong, C. Lenza, 1997 .