Infrared characteristics of sources associated with OH, H$_{2}$O, SiO
  and CH$_{3}$OH masers
  We collect all published OH, H2O, SiO and CH3OH masers in literature. The
associated infrared sources of these four masers were identified with MSX PSC
catalogues. We look for common infrared properties among the sources associated
with four masers and make a statistical study. The MSX sources associated with
stellar OH, stellar H2O and SiO masers concentrated in a small regions and the
MSX sources associated with interstellar OH, interstellar H2O and CH3OH masers
also concentrated in a small regions in an [A]-[D].vs.[A][-[E] diagram. These
results give us new criterion to search for coexisting stellar maser samples
for OH, H2O and SiO masers and interstellar maser samples for OH, H2O and CH3OH
masers.
