Some studies composed by Nico Cortlever (1915-1995, The Netherlands)

Article about Nico by Hans Bouwmeester (in Dutch)

Cortlever in 1939

Arves Book about studies of Nico Cortlever, written by Harrie Grondijs

At the IBM tournament in 1970.

Article History gives also an In Memoriam (in Dutch) about this Chessplayer.