@misc{indiciae5887cffdb134,
  title = {Analysis of the distribution of pitch angles in model galactic disks - Numerical methods and algorithms},
  author = {Russell, William S. and Roberts, William W., Jr.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930071237},
  note = {Source identifier: 19930071237}
}