Addresses:
| BURRIEL R, UNIV ZARAGOZA,CSIC,FAC CIENCIA,INST CIENCIAS MAT ARAGON,DEPT TERMOL,E-50009 ZARAGOZA,SPAIN UNIV ZARAGOZA,CSIC,INST CIENCIAS MAT AGRAGON,ETSIIZ,DEPT FIS,E-50009 ZARAGOZA,SPAIN FAC SCI LE MANS,PEC LAB,CNRS,UA 807,F-72017 LE MANS,FRANCE
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