A group with H-Frobenius element of even order

We settle Question 10.61 in the Kourovka Notebook for the case where the order of an element a is even.Supported by RFBR grant No. 03-01-00356 and by the Krasnoyarsk Science Foundation, project 11F0202C.Translated from Algebra i Logika, Vol. 44, No. 1, pp. 70–80, January–February, 2005.