@article{dorokhov_2007,  title={Distribution amplitudes of light mesons and the photon in the instanton model},  volume={37},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332007000500038},  DOI={10.1590/S0103-97332007000500038},  number={2c},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Dorokhov, Alexander E.},  year={2007},  month={Jun},  pages={819–821} }