Were can I get information on these artists?

Lea-anne I am working on an exhibition on modern craft and design in Canada (1945-80), Art Gallery of Greater Victoria, 2011. I will add info to CDR soon, but for now check their website. AC

I have a small plate (9 1/2″ diameter), blue with three figures in the center, signature on back. Where would I find info on it?

I have a silver necklace/pendent with an enameled bulls head, made by de Passille-Sylverstre could you send me any information on it please and thank you.