Equations (3.40) and (3.53) of the article contain small misprints. The correct formulas are

and

respectively. This has no influence on the rest of the article, nor on any of the conclusions. However, Fig. 8 should be replaced by the following:

FIG. 8.

A trajectory for V=a2y+b2x. Parameter E1=E2=k=1.

FIG. 8.

A trajectory for V=a2y+b2x. Parameter E1=E2=k=1.

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