@inbook{1317,
  author = {L.M. Simeza and M.M. Yovanovich},
  title = {Shape Factors for Hollow Prismatic Cylinders Bounded by Isothermal Inner Circles and Outer Rectangular Polygons},
  year = {1987},
  journal = {International Journal of Heat and Mass Transfer},
  volume = {30},
  pages = {812-816},
  publisher = {N/A},
}