Willi Hennig - Nature - 1981 - 514 pages
Methodological introduction; Localities for palaeozoic and mesozoic insects; The phyloggenetic development of the insecta; Concluding remarks and prospects for the future.
Willi Hennig - Science - 1999 - 263 pages
Phylogenetic Systematics, first published in 1966, marks a turning point in the history of systematic biology. Willi Hennig's influential synthetic work, arguing for the ...