diff --git a/papers/commands/helpers.py b/papers/commands/helpers.py
deleted file mode 100644
index 91db970..0000000
--- a/papers/commands/helpers.py
+++ /dev/null
@@ -1,70 +0,0 @@
-from .. import files
-from .. import color
-from .. import pretty
-from ..repo import InvalidReference
-from ..paper import NoDocumentFile
-from ..uis import get_ui
-
-
-def add_references_argument(parser, single=False):
-    if single:
-        parser.add_argument('reference',
-                help='reference to the paper (citekey or number)')
-    else:
-        parser.add_argument('references', nargs='*',
-                help="one or several reference to export (citekeysor numbers)")
-
-
-def add_docfile_to_paper(repo, paper, docfile, copy=False):
-    if copy:
-        repo.import_document(paper.citekey, docfile)
-    else:
-        paper.set_external_document(docfile)
-        repo.add_or_update(paper)
-
-
-def add_paper_with_docfile(repo, paper, docfile=None, copy=False):
-    repo.add_paper(paper)
-    if docfile is not None:
-        add_docfile_to_paper(repo, paper, docfile, copy=copy)
-
-
-def extract_doc_path_from_bibdata(paper):
-    try:
-        file_path = paper.get_document_file_from_bibdata(remove=True)
-        if files.check_file(file_path):
-            return file_path
-        else:
-            ui = get_ui()
-            ui.warning("File does not exist for %s (%s)."
-                       % (paper.citekey, file_path))
-    except NoDocumentFile:
-        return None
-
-
-def parse_reference(rp, ref):
-    try:
-        return rp.ref2citekey(ref)
-    except InvalidReference:
-        ui = get_ui()
-        ui.error("no paper with reference: %s."
-                    % color.dye(ref, color.citekey))
-        ui.exit(-1)
-
-
-def parse_references(rp, refs):
-    citekeys = [parse_reference(rp, ref) for ref in refs]
-    return citekeys
-
-def paper_oneliner(p, n = 0, citekey_only = False):
-    if citekey_only:
-        return p.citekey
-    else:
-        bibdesc = pretty.bib_oneliner(p.bibentry)
-        return (u'{num:d}: [{citekey}] {descr} {tags}'.format(
-            num=int(n),
-            citekey=color.dye(p.citekey, color.purple),
-            descr=bibdesc,
-            tags=color.dye(' '.join(p.tags),
-                           color.purple, bold=True),
-            )).encode('utf-8')