def reffinder(sectionObj):
    """
    add reference indeces to sectionobj['references']
    :param sectionObj
    :return: a section obj w references: field
    """
    text = sectionObj['text']
    reftags = [x for x in refTagRegEx.finditer(text)]
    if reftags:
        references = []
        for tag in reftags:
            references.append(int(tag.group(1)))

        sectionObj['references'] = references

        text = refTagRegEx.sub('', text)
        sectionObj['text'] = text

    return sectionObj