6Krzysztof M. Kryszczuk,Patrice Morier,Andrzej Drygajlo.Study of the distinctiveness Level 2 and Level 3 features in fragmen- tary fingerprint comparison[J].BioAW, 2004: 125-126.
7Anthonioz A, Egli N, Champod C, et al. Investigation of Repro- ducibility of Third-Level Characteristics[J]. Journal of Forensic Identifi, 2011,61 (2) : 172.