can accept two arguments:
k integer, used for table formatting (number of rows). Default value is 10.
pause logical, used to allow pause in screen scrolling of results. Default value is pause = FALSE.
width integer, used to define screen output width. Default value is width = 120.
verbose logical, used to allow screen output. Default is TRUE.
Value
The function summary computes and returns a list of summary statistics of the object of class bibliometrics.