@misc{indiciaeb254a11dd4a6,
  title = {[Experience with using written programmed control of student knowledge and instruction].},
  author = {G P Barsukov and P I Gurov},
  year = {1978},
  url = {https://pubmed.ncbi.nlm.nih.gov/634588/},
  note = {Source identifier: 634588}
}