@article{TAC_2006_16_a8,
     author = {Volodymyr Lyubashenko and Oleksandr Manzyuk},
     title = {Free {A_\infty-categories}},
     journal = {Theory and applications of categories},
     pages = {174--205},
     publisher = {mathdoc},
     volume = {16},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2006_16_a8/}
}