Püschel AW، Adams RH، Betz H (يونيو 1995). "Murine semaphorin D/collapsin is a member of a diverse gene family and creates domains inhibitory for axonal extension". Neuron. ج. 14 ع. 5: 941–8. DOI:10.1016/0896-6273(95)90332-1. PMID:7748561.
Püschel AW، Adams RH، Betz H (يونيو 1995). "Murine semaphorin D/collapsin is a member of a diverse gene family and creates domains inhibitory for axonal extension". Neuron. ج. 14 ع. 5: 941–8. DOI:10.1016/0896-6273(95)90332-1. PMID:7748561.