Alternatively, it may refer to the series. Context of the World List
In this reference system, "" is an abbreviation commonly used for Imperial or Imprenta (printing/press), and " 4 " typically denotes a specific volume or entry index. Based on the cataloguing style of the World List of Scientific Periodicals , this code points to: 45imp4
publications (specifically technical communications or reports). Alternatively, it may refer to the series