This paper could have cited Sasai (1998) (PMID = 9768831) and Paganelli et al, 2001 (PMID=11520668).
Compare Stancheva et al, 2003:
"Vertebrate neural tissues are derived from embryonic ectoderm, which receives inductive and patterning signals from Spemann's organizer and its derivatives (Kintner, 2002). Once induced, the neuroectoderm expresses intrinsic regulators of differentiation that govern the ultimate specification of primary neurons involved in mediating swimming and escape reflexes in the early tadpole"
with Sasai (1998):
"Vertebrate neural tissues are derived from embryonic ectoderm, which receives inductive and patterning signals from Spemann’s organizer and its derivative tissues. Once induced, the neuroectoderm expresses intrinsic positive and negative regulators of differentiation that govern the ultimate specification of primary neurons...involved primarily in mediating swimming and escape reflexes in the early tadpole"
Also, compare this section of Stancheva et al, 2003:
"Primary neurogenesis is controlled by the balanced expression of prepattern genes which, by exerting opposite functions, outline the sites where primary neuron formation will be permitted or excluded (Kintner, 2002). Within the proneural cluster, one cell is selected to develop into a neuronal precursor, while its neighbors are prevented from doing so. This lateral inhibition is mediated by the effector gene Notch and its membrane-bound ligand Delta (Kintner, 2002). Proneural genes such as NeuroD promote the expression of Delta in the selected cell, which interacts with the receptor Notch on the surface of the neighboring cell. The receptor is cleaved, and the Notch intracellular domain (NICD) enters the nucleus"
with Paganelli et al, 2001:
"By exerting opposite functions, prepattern genes outline the sites where primary neuron formation will be permitted or excluded.... Within the proneural cluster, one cell is singled out to develop into a neuronal precursor, while the neighbors are prevented from doing so. This process of lateral inhibition is mediated by the neurogenic gene Notch and its membrane-bound ligand Delta ( Chitnis et al., 1995). Proneural genes promote the expression of Delta in the selected cell ( Ma et al., 1996). Then, Delta interacts with the receptor Notch on the surface of the neighboring cell. The receptor is cleaved to render the intracellular domain (NotchICD) that enters the nucleus"