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The conceptual progress we've made comes from intense discussions with the radio astronomers (see for example Report on timing discussions with S. Johnson, M. Kramer, and I. Cognard at the 30 October 2007 Pulsar group meeting ( https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=27719 ) and from the studies we've done using Giant Radio Pulses and XMM data on a binary pulsar (see this presentation, made in Oct 07 in Manchester, for Michael Kramer et al).