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by Gruber, Hans
by Gruber, Hans; Harteis, Christian
by Hans Gruber; Christian Harteis
by Boshuizen, Henny P. A.; Bromme, Rainer; Gruber, Hans
by Gruber, Hans; Harteis, Christian; Heid, Helmut; et al.
by Gruber, Hans-Günter
by Gruber, Hans G.
by Hans Gruber; Christian Harteis; Helmut Heid