Extensive research on J.W. Schirmers pleinair practice in relation to related findings in the technical german 19th century literature on painting was published.
Several recently discovered paintings of the circle of J.W. Schirmer were examined and reattributed.
Johann Wilhelm Schirmer
„Man nannte das Studie und es fristete in der Kunstbewertung eine armselige Rolle“. In: G. v. Büren, M. Perse (Hrsg.): Jülicher Geschichtsblätter Bd. 82/83/84, Schirmerstudien (1) 2018, S.297 - 342