Gakh, G. I., M. I. Konchatnij, and N. P. Merenkov. “TRIPLET PRODUCTION BY A POLARIZED PHOTON BEAM ON A POLARIZED ELECTRON TARGET”. East European Journal of Physics, Vol. 2, no. 4, Mar. 2016, pp. 21-44, doi:10.26565/2312-4334-2015-4-02.