Yesterday, My Program Worked. Today, It Does Not. Why?

@inproceedings{Zeller:FSE99,
  author    = {Andreas Zeller},
  title     = {Yesterday, My Program Worked. Today, It Does Not. Why?},
  booktitle = {{ESEC/SIGSOFT} {FSE}},
  pages     = {253--267},
  series    = {LNCS},
  volume    = {1687},
  publisher = {Springer},
  year      = {1999},
  doi       = {10.1007/3-540-48166-4\_16},
}