Citation Rowlinson P (1974) On (1,4)-Groups I. Journal of the London Mathematical Society, s2-8 (3), pp. 493-498. https://doi.org/10.1112/jlms/s2-8.3.493
Abstract First paragraph: Let c and ƒbe integers, c ≥ 1, ƒ≥ 0: a (c, ƒ)-group is defined in  as a finite permutation group (G, Ω) such that (i) G is (at least) c-transitive on Ω, (ii) G has even order, (iii) ƒ is the maximal number of points of Ω fixed by an involution in G.
Journal Journal of the London Mathematical Society: Volume s2-8, Issue 3
Oxford University Press for London Mathematical Society