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Article
Helfrich, Charlotte and Engelmann, Wolfgang (1987) Evidences for circadian rhythmicity in the per0 mutant of Drosophila melanogaster. Zeitschrift für Naturforschung: Section C, A journal of biosciences 42, pp. 1335-1338.
Helfrich, Charlotte (1987) Use of Drosophila melanogaster brain mutants for the localization of the pacemaker of circadian locomotor activity rhythm. Journal of Neurogenetics 4 (2), pp. 137-140.
Helfrich, Charlotte (1986) Role of the optic lobes in the regulation of the locomotor activity of Drosophila melanogaster: Behavioral analysis of neural mutants. Journal of Neurogenetics 3 (6), pp. 321-343.
Helfrich, Charlotte and Cymborowski, Bronislaw and Engelmann, Wolfgang (1985) Circadian activity rhythm of the house fly continues after optic tract severance and lobectomy. Chronobiology International 2 (1), pp. 19-31.
Helfrich, Charlotte and Engelmann, Wolfgang (1983) Circadian rhythm of the locomotor activity in Drosophila melanogaster and its mutants "sine oculis" and "small optic lobes". Physiological Entomology 8 (3), pp. 257-272.
Thesis
Helfrich, Charlotte (1985) Untersuchungen über das circadiane System von Fliegen, Bedeutung der optischen Ganglien für die Laufaktivitätsrhythmik von Musca domestica und die Laufaktivitäts- und Schlüpfrhythmik von Drosophila melanogaster. PhD, Eberhard-Karls-Universität Tübingen.