The effect of atropine on soman-induced lesions in the central nervous system of the rat / Didima M.G. de Groot and Otto L. WolthuisComparison of methods for the estimation of the thickness of ultrathin tissue sections / Didima M.G. de GrootApplication of stereology and morphometry on synapses and neurons in the hippocampus of ageing rats : an illustration of problems and solutions / door Didima Maurice Gerarda de GrootApplication of stereology and morphometry on synapses and neurons in the hippocampus of ageing rats : an illustration of problems and solutions / door Didima Maurice Gerarda de Groot