George F. Timson
A Large «Balanced-Tree» Database
Proceedings of the 1978 MUMPS Users' Group Meeting, Volume 1978
J. Edward Volkstorf
Balanced Tree Globals: Experiences with DEC Standard MUMPS-11
Proceedings of the 1978 MUMPS Users' Group Meeting, Volume 1978
Anthony I. Wasserman and David D. Sherertz
A Balanced View of MUMPS
University of California at Davis CA, Technical Report 18 (1975)