[1] ECOLE NATL INGENIEURS,SFAX,TUNISIA
[2] MCGILL UNIV,DEPT GEOL SCI,MONTREAL H3A 2A7,QUEBEC,CANADA
[3] UNIV MARBURG,INST MINEROL PETR & KRISTALLOG,D-3550 MARBURG,FED REP GER
[4] ACAD SCI USSR,INST CRYSTALLOG,MOSCOW 117333,USSR
[5] UNIV OXFORD,CLARENDON LAB,OXFORD OX1 3PU,ENGLAND
[6] SMITH COLL,DEPT MATH,NORTHAMPTON,MA 01063
[7] OREGON STATE UNIV,DEPT CHEM,CORVALLIS,OR 97331
[8] UNIV KARLSRUHE,DEPT KRISTALLOG,D-7500 KARLSRUHE 1,FED REP GER
[9] RHEIN WESTFAL TH AACHEN,DEPT KRISTALLOG,D-5100 AACHEN,FED REP GER
[10] AT&T BELL LABS,MURRAY HILL,NJ 07974
[11] UNIV CHEM LAB,CRYSTALLOG DATA CTR,CAMBRIDGE CB2 1EW,ENGLAND