@article{10_2140_agt_2014_14_229,
     author = {Muro, Fernando},
     title = {Homotopy theory of non-symmetric operads, {II:} {Change} of base category and left properness},
     journal = {Algebraic and Geometric Topology},
     pages = {229--281},
     year = {2014},
     volume = {14},
     number = {1},
     doi = {10.2140/agt.2014.14.229},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2014.14.229/}
}