by Spargo, P.E
Published in Monthly notes of the Astronomical Society of Southern Africa (01.02.2013)

by Spargo, P.E.
Published in Monthly notes of the Astronomical Society of Southern Africa (01.02.2013)

by Spargo, P. E.
Published in Transactions of the Royal Society of South Africa (02.01.2016)

by Spargo, P.E
Published in Monthly notes of the Astronomical Society of Southern Africa (01.12.2008)

by Spargo, P.E.
Published in Monthly notes of the Astronomical Society of Southern Africa (01.11.2008)

by Spargo, P.E.
Published in Monthly notes of the Astronomical Society of Southern Africa (01.10.2008)

by Spargo, P.E.
Published in South African journal of science (01.07.2005)

by Spargo, P.E.
Published in Monthly notes of the Astronomical Society of Southern Africa (01.06.2008)

by Spargo, P.E.
Published in South African journal of science (01.04.1965)

by Laugksch, R.C. and Spargo, P.E.
Published in South African journal of science (01.10.1999)

by Enderstein, L.G, Spargo, P.E
Published in International journal of science education (01.07.1998)

by Spargo, P.E
Published in South African journal of science (01.04.1965)