1. E. B. Elliot, An Introduction to the Algebra of Quantics, 2nd ed., Cambridge University Press, Cambridge, 1913 (reprinted: Chelsea, New York, 1964).
2. On the Netto inversion number of a sequence
3. P. A. MacMahon, Combinatory Analysis, Vol. 1, Cambridge University Press, Cambridge, 1915 (reprinted: Chelsea, New York, 1960).