Variables created for reference types are typed managed references. The URL may also reference a local file as for example&colon; codice 11. The general reference for this section is . However, these do not reference any historical source. It is typical to record spectrum of both the sample and a "reference". HTTP/1.1 allows for either a relative URI reference or an absolute URI reference. Parts can reference members from other parts. This constitutes the earliest recorded reference to endoscopy. Method call behavior is different between value and reference classes. It is therefore a commonly used wavelength reference (secondary standard). Some of the traditional "tenses" express time reference together with aspectual information. Some see a clear reference to lynching. However, it did not reference Plan S specifically. The second (reference) beam illuminates the recording medium directly. The average diameter of the reference spheroid is .