Frey, U., Matthies, H. (Jun.), Reymann, K.G. and Matthies, H. (1991). The effect of dopaminergic D1-receptor blockade during tetanization on the expression of long-term potentiation in the CA1 region in vitro. Neurosci. Lett. 129, pp. 111-114.

Aronica, E., Frey, U., Wagner, M., Schröder, H., Krug, M., Rüthrich, H., Catania , M.V., Nicoletti, F. and Reymann, K.G. (1991). Enhanced sensitivity of "metabotropic" glutamate receptors after induction of long-term potentiation in rat hippocampus. J. Neurochem. 57, 376-383

Frey, U., Schröder, H. and Matthies, H. (1990). Dopaminergic antagonists prevent long-term maintenance of posttetanic LTP in the CA1 region of rat hippocampal slices, Brain Res. 552, pp. 69-75

Matthies, H., Frey, U., Krug, M., Pohle, W., Reymann, K. and Rüthrich, H. (1990). Long-term synaptic potentiation and macromolecular changes in memory formation. In: II. Neurobiological aspects of plasticity, Ergebn. Exp. Med. 51, pp. 88-94.

Matthies, H., Frey, U., Reymann, K., Krug, M., Jork, R. and Schröder, H. (1990). Different mechanisms and multiple stages of LTP. Adv. Exp. Med. Biol. 268, pp. 359-368

Frey, U., Hartmann, S. and Matthies, H. (1989). Domperidone, an inhibitor of the D2-receptor, blocks a late phase of an electrically induced LTP in the CA1-region in rats. Biomed. Bioch. Acta 48, pp. 473-476.

Frey, U., Krug, M., Brödemann, R., Reymann, K. and Matthies, H. (1989). Long-term potentiation induced in dendrites separated from their CA1 pyramidal somata does not establish a late phase. Neurosci. Lett. 97, pp. 135-139.

Matthies, H., Reymann, K.G., Krug, M., Frey, U., Lößner, B. and Popov., N. (1989). Multiple stages of posttetanic LTP and memory. In: Progress in Zoology, Vol. 37, Rahmann (Ed.): Fundamentals of Memory Formation: Neuronal Plasticity and Brain Function, Fischer- Verlag Stuttgart - New York , pp. 395-396.

Frey, U., Krug, M., Reymann, K.G. and Matthies, H. (1988). Anisomycin, an inhibitor of protein synthesis, blocks late phases of LTP phenomena in the hippocampal Ca1 region in vitro. Brain Res. 452, pp.57-65

Reymann, K., Frey, U. and Matthies, H. (1988). A multi-phase model of synaptic long-term potentaition in hippocampal CA1 neurons: Protein kinase C activation and protein synthesis are required for the maintenance of the trace. In: Synaptic plasticity in the Hippocampus , H.L. Haas and S. Buzsaki (eds.), Berlin-Heidelberg, Springer, pp.125-129.

Reymann, K.G., Frey, U. and Matthies, H. (1988). Polymyxin B, an inhibitor of protein kinase C, prevents the maintenance of synaptic long-term potentiation in hippocampal CA1 neurons. Brain Res. 440, pp. 305-314.

Reymann, K.G., Matthies, H.K., Frey, U. Vorobjov, V.S. and Matthies, H. (1986). Calcium-induced long-term potentiation in the hippocampal slice: Characterization of the time course and conditions. Brain Res. Bull. 7, pp. 291-296.