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diff --git a/doc/libs/dlmf.sty b/doc/libs/dlmf.sty
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+%% Copyright 2021 Ian Jauslin
+%% 
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%% 
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%% 
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+
+%%
+%% DLMF package:
+%%   cite equations from DLMF
+%%
+
+%% TeX format
+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+
+%% package name
+\ProvidesPackage{dlmf}[2020/05/01]
+
+%% dependencies
+\RequirePackage{color}
+\RequirePackage{hyperref}
+
+% get the first two numbers in (a.b.c);
+\def\@sectionnr(#1.#2.#3){#1.#2}
+
+% get the last number in (a.b.c);
+\def\@eqnr(#1.#2.#3){#3}
+
+% remove parentheses around argument
+\def\@cleanparentheses(#1){#1}
+
+%% cite DLMF equation
+\def\dlmfcite#1#2{\leavevmode%
+  \let\@dlmfcite@separator\@empty%
+  \cite[%
+    % loop over ',' separated list
+    \@for\@dlmfcite:=#1\do{%
+      % put commas between entries
+      \@dlmfcite@separator\def\@dlmfcite@separator{,\ }%
+      ({\color{blue}\href{https://dlmf.nist.gov/\expandafter\@sectionnr\@dlmfcite\#E\expandafter\@eqnr\@dlmfcite}{\expandafter\@cleanparentheses\@dlmfcite}})%
+    }%
+  ]{DLMF#2}%
+}
+
+%% end
+\endinput
+
+