Riordan EM, Krasny MW, Lang K, Bodek A, Dasu S, Varelas N, Wang X, Arnold R, Benton D, Bosted P, Clogher L, Lung A, Rock S, Szalata Z, Filippone BW, Walker RC, Bjorken JD, Crisler M, Para A, Lambert J, Button-Shafer J, Debebe B, Frodyma M, Hicks RS, Peterson GA, Gearhart R
Phys Rev Lett. 1987 Aug 17;59(7):755-758. doi: 10.1103/PhysRevLett.59.755.