Several articles on Edward Lear and Nonsense literature from Conceição Pereira:
Pereira, Conceição. “Nonsense e Literatura Infantil: os Limericks de Edward Lear.” A Criança, a Língua, o Imaginário e o Texto Literário. Actas do II Congresso Internacional. Universidade do Minho – Instituto de Estudos da Criança, 2006. (Academia.edu)
Pereira, Conceição. “Os limericks de Edward Lear: a idiotice ao serviço do nonsense.” Figuras do idiota, Literatura, Cinema e Banda Desenhada. Eds. Álvares, Cristina, Ana Lúcia Curado and Sérgio Guimarães de Sousa. Vila Nova de Famalicão: Húmus, 2015. 133-141. (Academia.edu)
Pereira, Conceição. “Nonsense em português.” De Lisboa para o mundo: ensaios sobre o humor luso-hispânico. Eds. Areias, Laura and Luís da Cunha Pinheiro. Lisboa: CLEPUL, 2013. 129-44. (Academia.edu)
Christopher Richardson has published a pair of long posts on Edward Lear:
Edward Lear: an artist who wrote one of the sweetest love stories, a review of Peck’s The Natural History of Edward Lear from the Financial Review.
Gillian Beer’s Alice in Space: The Sideways Victorian World of Lewis Carroll, a review of Beer’s latest book fro the Times Higher Education.
A Blog of Bosh 
In ‘E.L.: Destruction’ Christopher Richardson neatly explains why luminaries like George Orwell and Anthony Burgess had reservations about Lear’s invented words. His neologisms differ in kind from those of Lewis Carroll and James Joyce. A ‘Runcible Controversy’ could sharpen our view of Lear’s individuality.