@misc{indiciae31cfed79a097,
  title = {A Fortran 4 program for calculating and plotting surface area and pore size distribution data obtained by the BET-GAS adsorption method},
  author = {Halpert, G.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19680004050},
  note = {Source identifier: 19680004050}
}