Semi-inclusive deep inelastic scattering in Wandzura-Wilczek-type approximationS. Bastami, H. Avakian, A. V. Efremov, A. Kotzinian, B. U. Musch, B. Parsamyan, A. Prokudin, M. Schlegel, G. Schnell, P. Schweitzer and K. TezginEPJ Web Conf., 204 (2019) 01013DOI: https://doi.org/10.1051/epjconf/201920401013