[1] [1] Mally R. Ball point pen[J]. Kriminalistik, 1956, 10(2): 55-60.

[2] [2] Mathyer J. Ball pens and the expert appraisal of written documents[J]. Int Criminal Police Rev, 1950, 5: 191-192.

[3] [3] Vastrick T W. Illusions of tracing[J]. Journal of Forensic Sciences, 1982, 27(1): 186-191.

[4] [4] Harralson H H, Miller L S. Huber and Headrick's Handwriting Identification: Facts and Fundamentals[M]. 2018.

[5] [5] Fisher D. A statistical characterization of ballpoint pen sister lines[Master's thesis]. New York, NY: John Jay College of CriminalJustice; 2013.

[6] [6] Miville R, Marquis R, Mazzella W. Discrimination between right- and left-handed writers based on sister lines[J]. Journal of forensic sciences, 2024, 69(3): 959-965.

[7] [7] Ellen D, Day S, Davies C. Scientific examination of documents: methods and techniques[M]. CRC Press, 2018.

[12] [12] Sammons D F J. Application of Reflectance Transformation Imaging (RTI) to The Study ofAncient Graffiti fromHerculaneum, Italy[J]. Journal of Archaeological Science: Reports, 2018, 17: 184-194.

[13] [13] Malzbender T, Gelb D, Wolters H. Polynomial texture maps. Proceedings of the 28th annual conference on Computer graphics and interactive techniques, 2021, 519-528.

[14] [14] Newman E S. Applications of Reflectance Transformation Imaging (RTI) to the study of bone surface modifications[J]. Journal of Archaeological Science, 2015, 53: 536-549.

[15] [15] Mytum H, Peterson R J. The Application of Reflectance Transformation Imaging (RTI) in Historical Archaeology[J]. Historical Archaeology, 2018, 52(2): 489-503.

[16] [16] Cao J, Liu K, Liu L, et al. Identifying Mangrove Species Using Field Close-Range Snapshot Hyperspectral Imaging and Machine-Learning Techniques[J]. Remote Sensing, 2018, 10(12): 2047.

[17] [17] Silvia F, Anna R, Biancamaria A, et al. Application of Reflectance Transformation Imaging to Experimental Archaeology Studies[J]. Heritage, 2020, 3(4): 1279-1286.

[18] [18] Alessandra M, Hembo P, Mari T, et al. Application of Reflectance Transformation Imaging (RTI) to surface bone changes in paleopathology[J]. Anthropologischer Anzeiger, 2020, 78(4): 295-315.

[19] [19] Abigail D, Ian C, Richard A. Documenting Functional Use-Wear on Bone Tools: An RTI Approach[J]. Journal of Computer Applications in Archaeology, 2021, 4(1): 214-229.

[20] [20] Artal-Isbrand P, Klausmeyer P. Using Reflectance Transformation Imaging and 3D Laser Scanning Confocal Microscopy to Evaluate Relief and Contour Lines on Ancient Attic Greek Vases[J]. Microscopy Today, 2015, 23(4): 30-35.

[21] [21] Lemesle J, Robache F, Goic G L L, et al. Surface Reflectance: An Optical Method for Multiscale Curvature Characterization of Wear on Ceramic-Metal Composites[J]. Materials, 2020, 13(5): 1024.