Donald H. Glaeser, David B. Brown, S.S. Beltangady, J.H. Rex and S. Kulik
Further Exploitation of Bit Maps: an External Microprocessor Implementation
Proceedings of the 1979 MUMPS Users' Group Meeting, Volume 1979
Steven A. Jones and Don P. Ragan
Inverted File Structures Using Bit Maps Under Extended MUMPS-PC
Proceedings of the 1974 MUMPS Users' Group meeting, Volume 1974