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https://www.sciencedirect.com/science/article/pii/030439919390090K/pdf?md5=6b9c37aaeaaaa8f4da4df0fa383f4ae1&pid=1-s2.0-030439919390090K-main.pdf (Any fulltext)
https://doi.org/10.1016/0304-3991(93)90090-K (Any fulltext)
Müller, H., Völkel, B., Hofmann, M., Wöll, C., & Grunze, M. (1993). Emission properties of electron point sources. Ultramicroscopy, 50(1), 57-64. doi:10.1016/0304-3991(93)90090-K.