by Holmes, H.T., Paraskevopoulou, C., Hildyard, M., Neaupane, K., Connolly, D.P.
Published in Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World (2023)

by Elsherbeni, A.Z., Ying, Y., Smith, C.E., Rodriguez-Pereyra, V.
Published in Journal of the Franklin Institute (01.11.1996)

by Parkin, Geoffrey
Year of Publication 1996