@article{IM_1981__65_142842,
     author = {Bill Jacob},
     title = {The {Galois} {Cohomology} of {Pythagorean} {Fields.}},
     journal = {Inventiones mathematicae},
     pages = {97--114},
     publisher = {mathdoc},
     volume = {65},
     year = {1981},
     zbl = {0496.12017},
     url = {http://geodesic.mathdoc.fr/item/IM_1981__65_142842/}
}