Addendum on rotational properties of confined bosons: time-inversion referencing

In this addendum we introduce the concept of time-inversion referencing. This is an extension of hypertext allowing authors to cite papers that where not yet published (or even not yet written) when they publish a manuscript. We are convinced that this concept will prove very useful especially when adjustments to the so-called intellectual property rights have to be made. We apply the concept to our paper on rotational properties of trapped bosons.