diff --git a/course2526/seminars/posts/ES_203.pdf b/course2526/seminars/posts/ES_203.pdf
new file mode 100644
index 0000000..003329b
Binary files /dev/null and b/course2526/seminars/posts/ES_203.pdf differ
diff --git a/course2526/seminars/slides/ES_203.pdf b/course2526/seminars/slides/ES_203.pdf
new file mode 100644
index 0000000..6406bc5
Binary files /dev/null and b/course2526/seminars/slides/ES_203.pdf differ