Influence of seabird guano and camelid dung fertilization on the nitrogen isotopic composition of field-grown maize (Zea mays)Paul Szpak, Fred J. Longstaffe, Christine D. White et al.|Journal of Archaeological Science|2012Cited by 185
Carbon and Nitrogen Isotopic Survey of Northern Peruvian Plants: Baselines for Paleodietary and Paleoecological StudiesPaul Szpak, Víctor F. Vásquez Sánchez, Christine D. White et al.|PLoS ONE|2013Cited by 157
Small scale camelid husbandry on the north coast of Peru (Virú Valley): Insight from stable isotope analysisPaul Szpak, Fred J. Longstaffe, Jean‐François Millaire et al.|Journal of Anthropological Archaeology|2014Cited by 96
Stable Isotope Biogeochemistry of Seabird Guano Fertilization: Results from Growth Chamber Studies with Maize (Zea Mays)Paul Szpak, Christine D. White, Fred J. Longstaffe et al.|PLoS ONE|2012Cited by 89
Large variation in nitrogen isotopic composition of a fertilized legumePaul Szpak, Christine D. White, Fred J. Longstaffe et al.|Journal of Archaeological Science|2014Cited by 82