Debbaut, B., Marchal, JM., & Crochet, M. (1988). Numerical-simulation of Highly Viscoelastic Flows Through An Abrupt Contraction. Journal of Non-Newtonian Fluid Mechanics, 29(1-3), 119-146. https://doi.org/10.1016/0377-0257(88)85053-5 (Original work published 1988)