Equation Icon  I 1 2 3 2 1 3 3 1 2 W (p ) = (G2(G3 - n G1)p p + (G1G3 - n G2)p p + (G1G2 - n G3)p p ) (37) 1 (p2p3 )2 (p1p3 )2 (p1p2 )2 = -- --1-- + --2-- + --3-- - 2(p1)2- 2(p2)2 - 2(p3)2 4 p p p