@article{STNB_1970-1971____A6_0,
     author = {Cassels, J. W. S.},
     title = {On {Sums} of {Squares} and on {Elliptic} {Curves} over {Function} {Fields}},
     journal = {S\'eminaire de th\'eorie des nombres de Bordeaux},
     note = {talk:6},
     pages = {1--1},
     publisher = {Laboratoire de th\'eorie des nombres - Universit\'e de Bordeaux I},
     year = {1970-1971},
     language = {en},
     url = {http://archive.numdam.org/item/STNB_1970-1971____A6_0/}
}