00301nam a2200109Ia 4500082001700000100003600017245006100053260002900114300001500143500000500158700002800163  a516bL911.TD  aLovelock, David and Rund, Hanno  aTensors, differential forms and variational principlesb  aLondonbJohn Wileyc1975  axiv, 364p.  a  aRund, Hanno ; jt. auth.