Stendahl, U. et al. 1981. Invasive Squamous Cell Carcinoma of the Uterine Cervix II.: Reproducibility of a histopathologic malignancy grading system. Acta Oncologica. 20, 2 (Jan. 1981), 65–70. DOI:https://doi.org/10.3109/02841868109130422.