Cepheids in the LMC: Results from the MACHO Project
  The approximately 1500 Cepheid variables in 22 LMC fields of the MACHO Project survey have been calibrated and analysed. In this paper, we report improved period ratios for a total of 73 beat Cepheids and provide a first look at the Fourier decomposition parameters for both singly- and doubly-periodic Cepheids. We also note an unusual amplitude-changing pulsator. 
The MACHO Collaboration: D.L. Welch, C. Alcock, R.A. Allsman, D.R.   Alves, T.S. Axelrod, A. Becker, D.P. Bennett, K.H. Cook...