As suggested by this quote and discussed further below, Gunaratana 1988 states that meditation on these recollected subjects leads to "access concentration" but not to higher jhanic attainment. Gunaratana, Henepola (1988). The Jhanas in Theravada Buddhist Meditation. Kandy, Sri Lanka: Buddhist Publication Society. ISBN955-24-0035-X. Available online at www.budsas.org/ebud/jhanas/jhanas0a.htm.