CCD observation of 11 variables classified in the GCVS as RR Lyrae-type stars without light-curve elements
Journal article published in 2011 by
L. N. Berdnikov,
A. Y. U. Kniazev,
R. Sefako 
,
V. V. Kravtsov,
A. K. Dambis
,
V. V. Kravtsov,
A. K. Dambis
