Longitudinal study of preadolescent sport self-concept and performance: reciprocal effects and causal ordering. by Marsh, H, Gerlach, E, Trautwein, U, Lüdtke, O, Brettschneider, W

Multicenter clinical laboratory evaluation of a beta-lactamase disk assay employing a novel chromogenic cephalosporin, S1. by Doern, G, Jones, R, Gerlach, E, Washington, J, Biedenbach, D, Brueggemann, A, Erwin, M, Knapp, C, Raymond, J