“…The existence problem for a cyclic k-cycle system of K v has been solved, with the contribution of many authors ( [10,11,14,16,[18][19][20]23]), in the case of v ≡ 1 or k (mod 2k) (see also [2,4,12]). In all other cases it is conjectured (see [9,24]) that a cyclic k-cycle system of K v exists for any admissible pair (k, v) provided v>2k whenever gcd(k, v) is a prime power.…”