refer section or refer to section

There are multiple uses of "refer section":

352 For examples: refer section 4.2
672 ... Refer section 0 for details about handling
680 Refer section 3.3.1
786 Refer section 4.13
...

There is at least one case of:

3193 Refer to section

I think that the text should be "Refer to section N" or "See section N".