found: Adasch, N. Topological vector spaces, 1978 (a.e.)(Bruno Ernst) CIP data sheet (3/19/47)
found: His Der Zauberspiegel des M.C. Escher, 1983, c1978:t.p. (Bruno Ernst) p. 1 (Bruno Ernst, psyd. of a Dutch mathematician)
found: LC data base, 6-28-84(hdg.: Ernst, Bruno)
found: His Het begoochelde oog, c1986:t.p. (Bruno Ernst) p. 4 of cover (pseud. of J.A.F. de Rijk)
found: The magic mirror of M.C. Escher, 1976:title page (Bruno Ernst)
found: Wikipedia, June 3, 2016(Bruno Ernst; Bruno Ernst (pseudonym of JAF ( "Hans") de Rijk) (1926) is a Dutch physicist, physics and cosmography teacher, and publicist; he became internationally known for his books about the work of graphic artist Maurits Escher; he has published over 250 works under six pseudonyms on topics ranging from sundials and astronomy to calligraphy and art; he used separate pseudonyms for the various fields in which he published: Ben Elshout (photography and film); Ben Engelhart (graphology and writing); Bruno Ernst (exact science))
found: BnF, June 3, 2016(Ernst, Bruno (1926-) pseudonyme forme internationale; Netherlands; male; author, artist, mathematician, born 1926; other names: Rijk, Joannes Adrianus Friedrich de (1926-); De Rijk, Joannes Adrianus Friedrich (1926-); Rijk, J. A. F. de (1926-); De Rijk, J. A. F. (1926-); Rijk, Hans de (1926-); De Rijk, Hans (1926-); Erich, Bruno (1926-) pseudonym; Engelhart, Ben (1926-) pseudonym)
found: Deutsche National Bibliothek, June 3, 2016(Ernst, Bruno,1926-; born in Rotterdam; teacher; author; teaches mathematics and physics; published on astronomy, photography, history of writing, calligraphy; other names: Elshout, Ben (pseudonym); Engelhart, Ben (pseudonym); Rijk, J. A. F. de (real Name); Rijk, Hans)