MN Dra - In-the-Gap Dwarf Nova With Negative Superhumps
  The multi-site photometric observations of MN Dra were made over 77 nights in August-November, 2009. The total exposure was 433 hours. During this time the binary underwent two superoutbursts and five normal outbursts. During the course of first superoutburst period of positive superhumps decreased with extremely large $\dot P = -1.5 \times 1.0^{-4}$ for SU UMa-like dwarf novae, confirming known behavior of MN Dra [1]. Between the superoutbursts MN Dra displayed negative superhumps. Their period changed cyclically around 0.096-day value. 
Elena Pavlenko, Taichi Kato, Max Andreev, Alexandr Sklyanov, Alexandra   Zubareva, Denis Samsonov, Irina Voloshina, Vladimir...
astro-ph.SR