The hourglass and the early conservation models--co-existing patterns of developmental constraints in vertebrates
PLoS Genetics (2013) - Comments
pubmed: 23637639  doi: 10.1371/journal.pgen.1003476  issn: 1553-7404 

Barbara Piasecka, Paweł Lichocki, Sébastien Moretti, Sven Bergmann, Marc Robinson-Rechavi