@article{10_1017_S0017089502001064,
     author = {BECHTLUFT-SACHS, STEFAN},
     title = {TENSION {FIELD} {AND} {INDEX} {FORM} {OF} {ENERGY-TYPE} {FUNCTIONALS}},
     journal = {Glasgow mathematical journal},
     pages = {117--122},
     year = {2003},
     volume = {45},
     number = {1},
     doi = {10.1017/S0017089502001064},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089502001064/}
}