Provided are replication competent, recombinant adenovirus vectors containing mutations in the E1B region which permit the easy deletion of a gene or genes therein, and optionally the substitution therefore of a heterologous gene that substantially exhibits the temporal expression pattern of the E1b region gene deleted. The peer-to-peer platform may provide protocols for peer-to-peer services and applications that allow peers to discover each other, communicate with each other, and cooperate with each other to form peer groups. The side and end walls are with joined with said top wall to form arcuate upper edge contours of the brick, and are also formed with arcuate bottom edge contours such that, in an assembly of two bricks, one above the other, access grooves are formed by adjoining upper edge contours and bottom edge contours of the respective bricks to facilitate subsequent disassembly thereof. The relatively high energy pacing pulses may be delivered until capture is detected or until a predetermined number of paces are delivered. The method comprises providing a solution comprising a rare earth salt, an alkaline earth metal salt and a copper salt; spraying the solution onto a substrate to provide a film-covered substrate; and heating the film-covered substrate in an atmosphere containing fluorinated gas to provide the fluorinated precursor.