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@@ -338,3 +338,6 @@ And then the remaining $N - M$ equations can be solved in the normal unconstrain
1. G.B. Arfken, H.J. Weber,
*Mathematical methods for physicists*, 6th edition, 2005,
Elsevier.
+2. O. Bang,
+ *Applied mathematics for physicists: lecture notes*, 2019,
+ unpublished.