@MISC{COMMACAT.MIZ,
  AUTHOR = {Bancerek, Grzegorz and Darmochwa{\l}, Agata},
  TITLE = {Comma Category},
  DAY = {20},
  MONTH = {February},
  YEAR = {1992},
  ADDRESS1 = {Warsaw University, Bia{\l}ystok\\IM PAN, Warsaw},
  ADDRESS2 = {Warsaw University},
  SUMMARY = {Comma category of two functors is introduced.}}

