Using References (cont)

Examples of acceptable use of others' material:

and Smith [8] noted "M-trees do not assist Z queries".

and (Smith, 1998) noted "M-trees do not assist Z queries".

... and as was pointed out by Smith [8]:

M-trees do not assist Z queries. Even if the Z queries conform to the normal pattern of querying expected in this context, the algorithmic complexity is still too high.