596C.C3.A Applying Complex Exponential and Log to M.C. Escher
Burgiel, H., & Salomone, M. (2012). Logarithmic Spirals and Projective Geometry in MC Escher's" Path of Life III". Journal of Humanistic Mathematics, 2(1), 22-35. https://scholarship.claremont.edu/jhm/vol2/iss1/4/
Marcotte, J., & Salomone, M. (2014). Loxodromic spirals in MC Escher's sphere surface. Journal of Humanistic Mathematics, 4(2), 25-46. https://scholarship.claremont.edu/jhm/vol4/iss2/4/