@misc{indiciaea73466c81609,
  title = {Optimum design of ninety degree bends},
  author = {Modi, Vijay and Cabuk, Hayri and Huan, Jian-Chun and Quadracci, Richard},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920023030},
  note = {Source identifier: 19920023030}
}