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Optimal implicational bases for finite modular lattices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Marcel WildEach finite closure system, whence each finite lattice, can be described in terms of "implicational bases" (called "covers of functional dependencies" in relational database theory). Although a NP - complete problem in general, it turns out that for modular lattices... -
Growth, productivity, and scientific impact of sources of HIV/AIDS research information, with a focus on eastern and southern Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Omwoyo Bosire OnyanchaAs channels of communicating HIV/AIDS research information, serial publications and particularly journals are increasingly used in response to the pandemic. The last few decades have witnessed a proliferation of sources of HIV/AIDS-related information, bringing many challenges to collection-development librarians as... -
DNA barcoding of South Africa’s ornamental freshwater fish – are the names reliable?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KA van der Walt --- Department of Ichthyology and Fisheries Science, South Africa T Mäkinen --- South African Institute for Aquatic Biodiversity, South Africa ER Swartz --- South African Institute for Aquatic Biodiversity, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity, South AfricaTrade in freshwater ornamental fish in South Africa is currently regulated by a ‘blacklist’ to prevent potentially invasive taxa from establishing in the country. Because its effective implementation requires accurate identification, the aim of the present study was to test... -
The Africa Bird Data packages: African citizen science bird data in R
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Francisco Cervantes --- University of Cape Town, South Africa Alan TK Lee --- University of Cape Town, South Africa Dominic AW Henry --- University of Cape Town, South Africa Michael Brooks --- University of Cape Town, South Africa Vernon Visser --- University of Cape Town, South Africa Ané Cloete --- University of Cape Town, South Africa Nancy Job --- South African National Biodiversity Institute, South Africa Res Altwegg --- University of Cape Town, South AfricaThe African Bird Atlas Project (ABAP) and the Coordinated Waterbird Counts (CWAC) are the main citizen science bird monitoring programmes in southern Africa. ABAP data are collected by volunteers that compile bird lists over a grid of geographic areas known...