Geert Molenberghs
and Geert Verbeke
and Herbert Thijs
and Emmanuel Lesaffre
and Michael G. KenwardComputational Statistics \& Data Analysis37
93--113
(2001)
Mar{\'i}a Jos{\'e} Garc{\'i}a-Zattera
and Alejandro Jara
and Emmanuel Lesaffre
and Dominique DeclerckComputational Statistics \& Data Analysis51
3223--3234
(2007)