Gretchen Bartels, Of Men and Mice: C. S. Lewis on Male–Female Interaction, in Literature and Theology, vol. 22, n. 3, pp. 324-338, DOI:10.1093/litthe/frn026.
«This interpretation has become known amongst Lewis scholars and enthusiasts as the Problem of Susan, which was first coined by the writer Neil Gaiman in his short story by the same name.»