1
by Christensen, G.S., Soliman, S.A.
Published 1988
Springer US

2
by Christensen, G.S., Soliman, S.A., Nieva, R.
Published 1990
Springer US

3
by Christensen, G.S., El-Hawary, M.E., Soliman, S.A.
Published 1987
Springer US