on occasion of nominating A.Ershov "Senior Research Fellow".

on A.P. Ershov's scientific and organizational activities.

on A.P. Ershov's scientific and organizational activities in the years 1965-67.

on A.P. Ershov's scientific activities.

on A.P. Ershov's activities.

on scientific and administrative work of A.P. Ershov

on A.P. Ershov's activities.

on A.P. Ershov's scientific activity.