Singh , N and Mahmood, U and Kaul , V K and Jirovetz, L (2007) A new phthalic acid ester from Ajuga bracteosa. Tetrahedron (63). pp. 1000-1007.

Singh , N and Mahmood, U and Kaul, V K and Gupta , A P (2006) A new alkylated benzoquinone from rhizomes of Iris kumaonensis. Natural Product Research, 20 (1). pp. 75-78.

Singh , N and Gupta , A P and Singh , Bikram and Kaul , V K (2006) Quantification of Valerenic Acid in Valeriana jatamansi and Valeriana officinalis by HPTLC. CHROMATOGRAPHIA, 63. pp. 209-213.

Singh , N and Kaul , V K and Megeji, N W and Singh, Virendra and Ahuja, Paramvir Singh (2008) Essential oil composition of three accessions of Dracocephalum heterophyllum Benth. cultivated at Palampur, India. Natural Product Research, 22 (11). pp. 927-936.

Singh, N and Singh , Bikram and Gupta , A P and Kaul , V K (2005) Quantification of Picroside-I and Picroside-II in picrorhiza kurroa by HPTLC. Journal of Chromatography and Related Technologies, 28 (11). pp. 1679-1691. ISSN 1082-6076

Singh , Bikram and Singh, N and Gupta , A P and Kaul, V K (2006) Quantification of Valerenic Acid in Valeriana jatamansi and Valeriana officinalis by HPTLC. Chromatographia, 63. pp. 209-213.