Measurement of polarization parameters Sigma, T, and P in PI_0
photoproduction at E (GAMMA) = 0.9-GEV - 1.35 GEV.
K.Sh. Agababian, A.A. Belyaev, G.A. Vartapetian, V.A. Getman,
A.L. Golendukhin, I.I. Danilenko, A.P. Dzyubak, A.P. Kazarian,
A.A. Lukhanin, Zh.V. Manukian, K.K. Mkrtchian, E.G. Muradian, A.Yu.
Neffa, A.M. Sirunian, P.V. Sorokin, S.S. Stepanian
Sov.J.Nucl.Phys. v.50, (1989), pp.834-837, ( Yad.Fiz. v.50, 1989,
pp.1341-1347 ).