@article{10_2140_agt_2016_16_2691,
     author = {Hackney, Philip and Robertson, Marcy and Yau, Donald},
     title = {Relative left properness of colored operads},
     journal = {Algebraic and Geometric Topology},
     pages = {2691--2714},
     year = {2016},
     volume = {16},
     number = {5},
     doi = {10.2140/agt.2016.16.2691},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2016.16.2691/}
}