求助以下三篇文献，由于文献比较老了，花了很久时间按也没找到，希望有这些文献的同学能与我分享下，不胜感激。
Zv!XNc!"$y {l!{b1KJ 本人联系方式，QQ 631982167 Email:
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p7e51 Balmer, G. (1952). "A general analytical solution for Mohr's envelope." Am. Soc. Test. Mat. 52: 1269-1271.
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=&D Bishop.A.W (1955). "The use of the slip circle in the stability analysis of slopes." Géotechnique 5: 7-17.
3IQI={:k|D }xt^}:D Morgenstern, N. R. and Price.V.E. (1965). "The analysis of stability of general slip surface." Géotechnique 15: 79–93.
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