add reference

Author: dcoudert

src/doc/en/reference/references/index.rst

@@ -4700,6 +4700,12 @@ REFERENCES:
 .. [MM2015] \J. Matherne and \G. Muller, *Computing upper cluster algebras*,
             Int. Math. Res. Not. IMRN, 2015, 3121-3149.
 
+.. [MMRS2022] Ruslan G. Marzo, Rafael A. Melo,  Celso C. Ribeiro and
+              Marcio C. Santos: *New formulations and branch-and-cut procedures
+              for the longest induced path problem*. Computers & Operations
+              Research. 139, 105627 (2022)
+              :doi:`10.1016/j.cor.2021.105627`
+
 .. [Moh1988] \B. Mohar, *Isoperimetric inequalities, growth, and the spectrum
              of graphs*, Linear Algebra and its Applications 103 (1988),
              119–131.