30-Sep-74, A.M. Polyakov.
21-Oct-74, A.M. Polyakov.
31-Mar-75, A.M. Polyakov.
15-Sep-75, A.M. Polyakov.
22-Sep-75, A.M. Polyakov.
10-Nov-75, A.M. Polyakov.
15-Mar-76, A.M. Polyakov.
5-Apr-76, A.M. Polyakov.
13-Nov-78, A.M. Polyakov.
22-Nov-82, A.M. Polyakov.