Identification of DQ Serpentis and DT Serpentis as symbiotic starsD. Cieslinski, J. E. Steiner, F. Elizalde and M. G. PereiraAstron. Astrophys. Suppl. Ser., 124 1 (1997) 57-60DOI: https://doi.org/10.1051/aas:1997179