In many research articles numerical values are used for citing references in the text. I have seen the numbering of such references in pretty weird orders. In some texts, the references are sequenced as they are cited in the article. For example,
Statement X, says that the technique ABC solves the problem by utilizing the Y method
While in a few, they seem to follow random ordering like
Technique X[95,46,38] has been long used for solving the problem discussed in 
In some others
Technique X has been used in  to solve Y.
Are there any standard conventions or best practice for ordering the references ?
(My field is computer science)