Roca & Bravo 1993. The occurrence of Xiphinema sphaerocephalum Lamberti et al. and X. hispanum Lamberti et al. (Nematoda: Longidoridae) in Portugal with descriptions of X. lanceolatum sp. n. and X. lapidosum sp. n. Fundamental and Applied Nematology, 16(5) 1993: 455-465