Atanas Ivanov, honorary chairman of the Bulgarian Communists Union, said this at the releasing ceremony of the work held at a publishing house of Bulgaria on July 29.

In a speech he noted that the work is replete with Kim Jong Un's firm will to successfully carry forward the cause of Juche, the cause of Songun pioneered by President Kim Il Sung and accomplish it through generations.

The succession to leader's cause is a key to preserving and accomplishing the socialist cause, he stressed.