Citradia, don't use damp paper. Here is how commercial citrus seed suppliers treat and store their seed. Thoroughly wash the seed, then the washed seed is surface sterilized with 125-F water for 10 minutes, dipped in 1% 8-hydroxyquinoline sulfate (8-HQC fungicide), air-dried on screens in the shade, and packaged in plastic bags. When storing, it is important to leave these storage bags open initially until the seed equilibrate with the refrigeration temperature. If the bags are closed before refrigeration, the undissipated heat and humidity may generate condensation inside the bags, which promotes fungal pathogens. Seed can be stored at 40-F for as long as 6 months with little loss of viability. Seed stored at room temperature looses viability quickly. 8-HQC might be difficult to find, but you can use the common Daconil fungicide which you should be able to find at any good nursery,