Thomas Hartkens Karl Rohr H. Siegfried Stiehl Evaluation of 3D Operators for the Detection of Anatomical Point Landmarks in MR and CT Images. 118-136 2002 86 Comput. Vis. Image Underst. 2 https://doi.org/10.1006/cviu.2002.0964 db/journals/cviu/cviu86.html#HartkensRS02