Batanin, Michael Max Planck Institute for Mathematics, Max Planck Society;
http://www.tac.mta.ca/tac/volumes/33/7/33-07abs.html (Publisher version)
Batanin-Koch-Weber_Regular patterns, substitudes, Feynman categories and operads_2018.pdf (Publisher version), 583KB
Batanin, M., Kock, J., & Weber, M. (2018). Regular patterns, substitudes, Feynman categories and operads. Theory and Applications of Categories, 33: 7, pp. 148-192.